31705413812 has 24 divisors (see below), whose sum is σ = 57024872520. Its totient is φ = 15413207040.

The previous prime is 31705413811. The next prime is 31705413871. The reversal of 31705413812 is 21831450713.

It can be written as a sum of positive squares in 4 ways, for example, as 4017784996 + 27687628816 = 63386^2 + 166396^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31705413811) 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 7 ways as a sum of consecutive naturals, for example, 132512 + ... + 284552.

It is an arithmetic number, because the mean of its divisors is an integer number (2376036355).

Almost surely, 2^31705413812 is an apocalyptic number.

It is an amenable number.

31705413812 is a deficient number, since it is larger than the sum of its proper divisors (25319458708).

31705413812 is a wasteful number, since it uses less digits than its factorization.

31705413812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153491 (or 153489 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 31705413812 in words is "thirty-one billion, seven hundred five million, four hundred thirteen thousand, eight hundred twelve".