12940659531 has 24 divisors (see below), whose sum is σ = 19459842480. Its totient is φ = 8276538816.

The previous prime is 12940659527. The next prime is 12940659547. The reversal of 12940659531 is 13595604921.

12940659531 is a `hidden beast` number, since 1 + 29 + 4 + 0 + 6 + 595 + 31 = 666.

It is not a de Polignac number, because 12940659531 - 2² = 12940659527 is a prime.

It is a super-2 number, since 2×12940659531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12940659521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116925 + ... + 198878.

It is an arithmetic number, because the mean of its divisors is an integer number (810826770).

Almost surely, 2^12940659531 is an apocalyptic number.

12940659531 is a deficient number, since it is larger than the sum of its proper divisors (6519182949).

12940659531 is a wasteful number, since it uses less digits than its factorization.

12940659531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315995 (or 315992 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 12940659531 in words is "twelve billion, nine hundred forty million, six hundred fifty-nine thousand, five hundred thirty-one".