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491021 = 2631867
BaseRepresentation
bin1110111111000001101
3220221112222
41313320031
5111203041
614305125
74113356
oct1677015
9827488
10491021
11305a03
121b81a5
1314265b
14cad2d
159a74b
hex77e0d

491021 has 4 divisors (see below), whose sum is σ = 493152. Its totient is φ = 488892.

The previous prime is 491003. The next prime is 491039. The reversal of 491021 is 120194.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (491003) and next prime (491039).

It is a cyclic number.

It is not a de Polignac number, because 491021 - 26 = 490957 is a prime.

It is a super-2 number, since 2×4910212 = 482203244882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 491021.

It is not an unprimeable number, because it can be changed into a prime (491041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 671 + ... + 1196.

It is an arithmetic number, because the mean of its divisors is an integer number (123288).

2491021 is an apocalyptic number.

It is an amenable number.

491021 is a deficient number, since it is larger than the sum of its proper divisors (2131).

491021 is a wasteful number, since it uses less digits than its factorization.

491021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 491021 is about 700.7289062112. The cubic root of 491021 is about 78.8920707424.

The spelling of 491021 in words is "four hundred ninety-one thousand, twenty-one".

Divisors: 1 263 1867 491021