491213697 has 16 divisors (see below), whose sum is σ = 708687168. Its totient is φ = 300847680.

The previous prime is 491213689. The next prime is 491213711. The reversal of 491213697 is 796312194.

It is not a de Polignac number, because 491213697 - 2³ = 491213689 is a prime.

It is a super-2 number, since 2×491213697² = 482581792240815618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491213677) 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, 21618 + ... + 38075.

It is an arithmetic number, because the mean of its divisors is an integer number (44292948).

Almost surely, 2^491213697 is an apocalyptic number.

It is an amenable number.

491213697 is a deficient number, since it is larger than the sum of its proper divisors (217473471).

491213697 is a wasteful number, since it uses less digits than its factorization.

491213697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59920.

The product of its digits is 81648, while the sum is 42.

The square root of 491213697 is about 22163.3412869089. The cubic root of 491213697 is about 789.0238956589.

The spelling of 491213697 in words is "four hundred ninety-one million, two hundred thirteen thousand, six hundred ninety-seven".