31281155442 has 24 divisors (see below), whose sum is σ = 67780262160. Its totient is φ = 10426371000.

The previous prime is 31281155441. The next prime is 31281155471. The reversal of 31281155442 is 24455118213.

31281155442 is a `hidden beast` number, since 31 + 2 + 81 + 1 + 5 + 544 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 31281155397 and 31281155406.

It is not an unprimeable number, because it can be changed into a prime (31281155441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 280909 + ... + 376127.

It is an arithmetic number, because the mean of its divisors is an integer number (2824177590).

Almost surely, 2^31281155442 is an apocalyptic number.

31281155442 is an abundant number, since it is smaller than the sum of its proper divisors (36499106718).

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

31281155442 is a wasteful number, since it uses less digits than its factorization.

31281155442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113478 (or 113475 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The spelling of 31281155442 in words is "thirty-one billion, two hundred eighty-one million, one hundred fifty-five thousand, four hundred forty-two".