31681634385 has 32 divisors (see below), whose sum is σ = 52046805888. Its totient is φ = 16447495680.

The previous prime is 31681634381. The next prime is 31681634389. The reversal of 31681634385 is 58343618613.

It is an interprime number because it is at equal distance from previous prime (31681634381) and next prime (31681634389).

It is not a de Polignac number, because 31681634385 - 2² = 31681634381 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31681634381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105165 + ... + 272805.

It is an arithmetic number, because the mean of its divisors is an integer number (1626462684).

Almost surely, 2^31681634385 is an apocalyptic number.

It is an amenable number.

31681634385 is a deficient number, since it is larger than the sum of its proper divisors (20365171503).

31681634385 is a wasteful number, since it uses less digits than its factorization.

31681634385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167985.

The product of its digits is 1244160, while the sum is 48.

The spelling of 31681634385 in words is "thirty-one billion, six hundred eighty-one million, six hundred thirty-four thousand, three hundred eighty-five".