31987629649 has 12 divisors (see below), whose sum is σ = 33037353360. Its totient is φ = 30969005600.

The previous prime is 31987629617. The next prime is 31987629671. The reversal of 31987629649 is 94692678913.

It is not a de Polignac number, because 31987629649 - 2⁵ = 31987629617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31987629689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147582 + ... + 292840.

It is an arithmetic number, because the mean of its divisors is an integer number (2753112780).

Almost surely, 2^31987629649 is an apocalyptic number.

It is an amenable number.

31987629649 is a deficient number, since it is larger than the sum of its proper divisors (1049723711).

31987629649 is a wasteful number, since it uses less digits than its factorization.

31987629649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145472 (or 145431 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 64.

The spelling of 31987629649 in words is "thirty-one billion, nine hundred eighty-seven million, six hundred twenty-nine thousand, six hundred forty-nine".