491011564 has 6 divisors (see below), whose sum is σ = 859270244. Its totient is φ = 245505780.

The previous prime is 491011519. The next prime is 491011579. The reversal of 491011564 is 465110194.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61376442 + ... + 61376449.

Almost surely, 2^491011564 is an apocalyptic number.

It is an amenable number.

491011564 is a deficient number, since it is larger than the sum of its proper divisors (368258680).

491011564 is a wasteful number, since it uses less digits than its factorization.

491011564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122752895 (or 122752893 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 491011564 is about 22158.7807426311. The cubic root of 491011564 is about 788.9156538018.

The spelling of 491011564 in words is "four hundred ninety-one million, eleven thousand, five hundred sixty-four".