31280989916 has 24 divisors (see below), whose sum is σ = 59762054016. Its totient is φ = 14208203120.

The previous prime is 31280989913. The next prime is 31280989963. The reversal of 31280989916 is 61998908213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31280989913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199886 + ... + 320181.

It is an arithmetic number, because the mean of its divisors is an integer number (2490085584).

Almost surely, 2^31280989916 is an apocalyptic number.

It is an amenable number.

31280989916 is a deficient number, since it is larger than the sum of its proper divisors (28481064100).

31280989916 is a wasteful number, since it uses less digits than its factorization.

31280989916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521449 (or 521447 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 56.

The spelling of 31280989916 in words is "thirty-one billion, two hundred eighty million, nine hundred eighty-nine thousand, nine hundred sixteen".