31199138544 has 80 divisors (see below), whose sum is σ = 95083120640. Its totient is φ = 8626487040.

The previous prime is 31199138543. The next prime is 31199138587. The reversal of 31199138544 is 44583199113.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 31199138493 and 31199138502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31199138543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1487239 + ... + 1508070.

It is an arithmetic number, because the mean of its divisors is an integer number (1188539008).

Almost surely, 2^31199138544 is an apocalyptic number.

It is an amenable number.

31199138544 is an abundant number, since it is smaller than the sum of its proper divisors (63883982096).

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

31199138544 is a wasteful number, since it uses less digits than its factorization.

31199138544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2995358 (or 2995352 counting only the distinct ones).

The product of its digits is 466560, while the sum is 48.

The spelling of 31199138544 in words is "thirty-one billion, one hundred ninety-nine million, one hundred thirty-eight thousand, five hundred forty-four".