312131209986 has 12 divisors (see below), whose sum is σ = 676284288342. Its totient is φ = 104043736656.

The previous prime is 312131209967. The next prime is 312131210011. The reversal of 312131209986 is 689902131213.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 304654322025 + 7476887961 = 551955^2 + 86469^2 .

It is a super-2 number, since 2×312131209986² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8670311371 + ... + 8670311406.

Almost surely, 2^312131209986 is an apocalyptic number.

312131209986 is an abundant number, since it is smaller than the sum of its proper divisors (364153078356).

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

312131209986 is a wasteful number, since it uses less digits than its factorization.

312131209986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17340622785 (or 17340622782 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 312131209986 in words is "three hundred twelve billion, one hundred thirty-one million, two hundred nine thousand, nine hundred eighty-six".