31670520918 has 32 divisors (see below), whose sum is σ = 66689308800. Its totient is φ = 9999038016.

The previous prime is 31670520877. The next prime is 31670520919. The reversal of 31670520918 is 81902507613.

It is a self number, because there is not a number n which added to its sum of digits gives 31670520918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31670520919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 542578 + ... + 598106.

It is an arithmetic number, because the mean of its divisors is an integer number (2084040900).

Almost surely, 2^31670520918 is an apocalyptic number.

31670520918 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

31670520918 is an abundant number, since it is smaller than the sum of its proper divisors (35018787882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31670520918 is a wasteful number, since it uses less digits than its factorization.

31670520918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60556.

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 31670520918 in words is "thirty-one billion, six hundred seventy million, five hundred twenty thousand, nine hundred eighteen".