312531999999 has 4 divisors (see below), whose sum is σ = 416709333336. Its totient is φ = 208354666664.

The previous prime is 312531999973. The next prime is 312532000019. The reversal of 312531999999 is 999999135213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 312531999999 - 2¹² = 312531995903 is a prime.

312531999999 is a modest number, since divided by 999999 gives 312531 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312531999499) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 52088666664 + ... + 52088666669.

It is an arithmetic number, because the mean of its divisors is an integer number (104177333334).

Almost surely, 2^312531999999 is an apocalyptic number.

312531999999 is a deficient number, since it is larger than the sum of its proper divisors (104177333337).

312531999999 is a wasteful number, since it uses less digits than its factorization.

312531999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104177333336.

The product of its digits is 47829690, while the sum is 69.

The spelling of 312531999999 in words is "three hundred twelve billion, five hundred thirty-one million, nine hundred ninety-nine thousand, nine hundred ninety-nine".