31636660491 has 12 divisors (see below), whose sum is σ = 45706152960. Its totient is φ = 21087066480.

The previous prime is 31636660481. The next prime is 31636660499. The reversal of 31636660491 is 19406663613.

It is not a de Polignac number, because 31636660491 - 2⁹ = 31636659979 is a prime.

It is a super-3 number, since 3×31636660491³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (31636660499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 286731 + ... + 381428.

It is an arithmetic number, because the mean of its divisors is an integer number (3808846080).

Almost surely, 2^31636660491 is an apocalyptic number.

31636660491 is a deficient number, since it is larger than the sum of its proper divisors (14069492469).

31636660491 is a wasteful number, since it uses less digits than its factorization.

31636660491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673426 (or 673423 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The spelling of 31636660491 in words is "thirty-one billion, six hundred thirty-six million, six hundred sixty thousand, four hundred ninety-one".