31634307881 has 6 divisors (see below), whose sum is σ = 34771594746. Its totient is φ = 28758461600.

The previous prime is 31634307839. The next prime is 31634307917. The reversal of 31634307881 is 18870343613.

It can be written as a sum of positive squares in only one way, i.e., 24120885481 + 7513422400 = 155309^2 + 86680^2 .

It is not a de Polignac number, because 31634307881 - 2²² = 31630113577 is a prime.

It is a super-2 number, since 2×31634307881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31634307581) 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, 130720160 + ... + 130720401.

It is an arithmetic number, because the mean of its divisors is an integer number (5795265791).

Almost surely, 2^31634307881 is an apocalyptic number.

It is an amenable number.

31634307881 is a deficient number, since it is larger than the sum of its proper divisors (3137286865).

31634307881 is a wasteful number, since it uses less digits than its factorization.

31634307881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261440583 (or 261440572 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 31634307881 in words is "thirty-one billion, six hundred thirty-four million, three hundred seven thousand, eight hundred eighty-one".