491533057 has 4 divisors (see below), whose sum is σ = 491705280. Its totient is φ = 491360836.

The previous prime is 491533037. The next prime is 491533079. The reversal of 491533057 is 750335194.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491533057 is a prime.

It is a super-2 number, since 2×491533057² = 483209492247530498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491533037) 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, 81757 + ... + 87562.

It is an arithmetic number, because the mean of its divisors is an integer number (122926320).

Almost surely, 2^491533057 is an apocalyptic number.

It is an amenable number.

491533057 is a deficient number, since it is larger than the sum of its proper divisors (172223).

491533057 is a wasteful number, since it uses less digits than its factorization.

491533057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172222.

The product of its (nonzero) digits is 56700, while the sum is 37.

The square root of 491533057 is about 22170.5448061161. The cubic root of 491533057 is about 789.1948518600.

The spelling of 491533057 in words is "four hundred ninety-one million, five hundred thirty-three thousand, fifty-seven".