Search a number
-
+
642031 = 13229131
BaseRepresentation
bin10011100101111101111
31012121200221
42130233233
5131021111
621432211
75312545
oct2345757
91177627
10642031
113a9405
1226b667
13196300
14129d95
15ca371
hex9cbef

642031 has 12 divisors (see below), whose sum is σ = 724680. Its totient is φ = 567840.

The previous prime is 642013. The next prime is 642049. The reversal of 642031 is 130246.

642031 = T26 + T27 + ... + T156.

It is an interprime number because it is at equal distance from previous prime (642013) and next prime (642049).

It is not a de Polignac number, because 642031 - 29 = 641519 is a prime.

It is a super-2 number, since 2×6420312 = 824407609922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641996 and 642014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4836 + ... + 4966.

It is an arithmetic number, because the mean of its divisors is an integer number (60390).

2642031 is an apocalyptic number.

642031 is a deficient number, since it is larger than the sum of its proper divisors (82649).

642031 is a wasteful number, since it uses less digits than its factorization.

642031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 642031 is about 801.2683695242. The cubic root of 642031 is about 86.2684508591.

Adding to 642031 its reverse (130246), we get a palindrome (772277).

The spelling of 642031 in words is "six hundred forty-two thousand, thirty-one".

Divisors: 1 13 29 131 169 377 1703 3799 4901 22139 49387 642031