31212717378786 has 12 divisors (see below), whose sum is σ = 67627554320742. Its totient is φ = 10404239126256.

The previous prime is 31212717378653. The next prime is 31212717378797. The reversal of 31212717378786 is 68787371721213.

31212717378786 is a `hidden beast` number, since 3 + 121 + 2 + 71 + 7 + 378 + 78 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20440661688225 + 10772055690561 = 4521135^2 + 3282081^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 867019927171 + ... + 867019927206.

Almost surely, 2^{31212717378786} is an apocalyptic number.

31212717378786 is an abundant number, since it is smaller than the sum of its proper divisors (36414836941956).

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

31212717378786 is a wasteful number, since it uses less digits than its factorization.

31212717378786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734039854385 (or 1734039854382 counting only the distinct ones).

The product of its digits is 33191424, while the sum is 63.

The spelling of 31212717378786 in words is "thirty-one trillion, two hundred twelve billion, seven hundred seventeen million, three hundred seventy-eight thousand, seven hundred eighty-six".