31523013420 has 96 divisors (see below), whose sum is σ = 88743174912. Its totient is φ = 8360663808.

The previous prime is 31523013407. The next prime is 31523013421. The reversal of 31523013420 is 2431032513.

It is not an unprimeable number, because it can be changed into a prime (31523013421) 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, 11086519 + ... + 11089361.

It is an arithmetic number, because the mean of its divisors is an integer number (924408072).

Almost surely, 2^31523013420 is an apocalyptic number.

31523013420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31523013420 is an abundant number, since it is smaller than the sum of its proper divisors (57220161492).

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

31523013420 is a wasteful number, since it uses less digits than its factorization.

31523013420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3791 (or 3789 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 31523013420 its reverse (2431032513), we get a palindrome (33954045933).

The spelling of 31523013420 in words is "thirty-one billion, five hundred twenty-three million, thirteen thousand, four hundred twenty".