491692644931 has 6 divisors (see below), whose sum is σ = 499140878460. Its totient is φ = 484353944316.

The previous prime is 491692644917. The next prime is 491692644967. The reversal of 491692644931 is 139446296194.

It is not a de Polignac number, because 491692644931 - 2⁵ = 491692644899 is a prime.

It is a super-2 number, since 2×491692644931² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491692644031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54761901 + ... + 54770878.

It is an arithmetic number, because the mean of its divisors is an integer number (83190146410).

Almost surely, 2^491692644931 is an apocalyptic number.

491692644931 is a deficient number, since it is larger than the sum of its proper divisors (7448233529).

491692644931 is an equidigital number, since it uses as much as digits as its factorization.

491692644931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109532913 (or 109532846 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 58.

The spelling of 491692644931 in words is "four hundred ninety-one billion, six hundred ninety-two million, six hundred forty-four thousand, nine hundred thirty-one".