491057 has 16 divisors (see below), whose sum is σ = 604800. Its totient is φ = 389760.

The previous prime is 491041. The next prime is 491059. The reversal of 491057 is 750194.

It is not a de Polignac number, because 491057 - 2⁴ = 491041 is a prime.

It is a super-2 number, since 2×491057² = 482273954498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8294 + ... + 8352.

It is an arithmetic number, because the mean of its divisors is an integer number (37800).

2⁴⁹¹⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

491057 is a deficient number, since it is larger than the sum of its proper divisors (113743).

491057 is a wasteful number, since it uses less digits than its factorization.

491057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 491057 is about 700.7545932778. The cubic root of 491057 is about 78.8939987286.

The spelling of 491057 in words is "four hundred ninety-one thousand, fifty-seven".