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641421 = 321121931
BaseRepresentation
bin10011100100110001101
31012120212100
42130212031
5131011141
621425313
75311014
oct2344615
91176770
10641421
113a8a00
1226b239
13195c51
14129a7b
15ca0b6
hex9c98d

641421 has 36 divisors (see below), whose sum is σ = 1106560. Its totient is φ = 356400.

The previous prime is 641419. The next prime is 641437. The reversal of 641421 is 124146.

641421 is a `hidden beast` number, since 641 + 4 + 21 = 666.

641421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 641421 - 21 = 641419 is a prime.

It is a super-2 number, since 2×6414212 = 822841798482, which contains 22 as substring.

Its product of digits (192) is a multiple of the sum of its prime divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 641394 and 641403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641411) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20676 + ... + 20706.

2641421 is an apocalyptic number.

It is an amenable number.

641421 is a deficient number, since it is larger than the sum of its proper divisors (465139).

641421 is a wasteful number, since it uses less digits than its factorization.

641421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 64 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 641421 is about 800.8876325678. The cubic root of 641421 is about 86.2411206990.

Adding to 641421 its reverse (124146), we get a palindrome (765567).

It can be divided in two parts, 64 and 1421, that added together give a triangular number (1485 = T54).

The spelling of 641421 in words is "six hundred forty-one thousand, four hundred twenty-one".

Divisors: 1 3 9 11 19 31 33 57 93 99 121 171 209 279 341 363 589 627 1023 1089 1767 1881 2299 3069 3751 5301 6479 6897 11253 19437 20691 33759 58311 71269 213807 641421