31031009136 has 120 divisors (see below), whose sum is σ = 88934040000. Its totient is φ = 10097657856.

The previous prime is 31031009129. The next prime is 31031009137. The reversal of 31031009136 is 63190013013.

31031009136 is a `hidden beast` number, since 310 + 310 + 0 + 9 + 1 + 36 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31031009137) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 997140 + ... + 1027788.

It is an arithmetic number, because the mean of its divisors is an integer number (741117000).

Almost surely, 2^31031009136 is an apocalyptic number.

31031009136 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31031009136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44467020000).

31031009136 is an abundant number, since it is smaller than the sum of its proper divisors (57903030864).

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

31031009136 is a wasteful number, since it uses less digits than its factorization.

31031009136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30831 (or 30822 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The spelling of 31031009136 in words is "thirty-one billion, thirty-one million, nine thousand, one hundred thirty-six".