31287843812 has 6 divisors (see below), whose sum is σ = 54753726678. Its totient is φ = 15643921904.

The previous prime is 31287843809. The next prime is 31287843833. The reversal of 31287843812 is 21834878213.

It can be written as a sum of positive squares in only one way, i.e., 24494128036 + 6793715776 = 156506^2 + 82424^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3910980473 + ... + 3910980480.

It is an arithmetic number, because the mean of its divisors is an integer number (9125621113).

Almost surely, 2^31287843812 is an apocalyptic number.

It is an amenable number.

31287843812 is a deficient number, since it is larger than the sum of its proper divisors (23465882866).

31287843812 is a wasteful number, since it uses less digits than its factorization.

31287843812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7821960957 (or 7821960955 counting only the distinct ones).

The product of its digits is 516096, while the sum is 47.

The spelling of 31287843812 in words is "thirty-one billion, two hundred eighty-seven million, eight hundred forty-three thousand, eight hundred twelve".