31312404217044 has 72 divisors (see below), whose sum is σ = 81041858817920. Its totient is φ = 10188399376512.

The previous prime is 31312404217043. The next prime is 31312404217067. The reversal of 31312404217044 is 44071240421313.

31312404217044 is a `hidden beast` number, since 3 + 1 + 3 + 124 + 0 + 421 + 70 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312404217043) 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, 3795052 + ... + 8776515.

Almost surely, 2^{31312404217044} is an apocalyptic number.

It is an amenable number.

31312404217044 is an abundant number, since it is smaller than the sum of its proper divisors (49729454600876).

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

31312404217044 is a wasteful number, since it uses less digits than its factorization.

31312404217044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12573229 (or 12573224 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

Adding to 31312404217044 its reverse (44071240421313), we get a palindrome (75383644638357).

The spelling of 31312404217044 in words is "thirty-one trillion, three hundred twelve billion, four hundred four million, two hundred seventeen thousand, forty-four".