312636510121 has 4 divisors (see below), whose sum is σ = 336685472452. Its totient is φ = 288587547792.

The previous prime is 312636510119. The next prime is 312636510143. The reversal of 312636510121 is 121015636213.

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

It can be written as a sum of positive squares in 2 ways, for example, as 67774832896 + 244861677225 = 260336^2 + 494835^2 .

It is a cyclic number.

It is not a de Polignac number, because 312636510121 - 2¹ = 312636510119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312636510821) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 12024481146 + ... + 12024481171.

It is an arithmetic number, because the mean of its divisors is an integer number (84171368113).

Almost surely, 2^312636510121 is an apocalyptic number.

It is an amenable number.

312636510121 is a deficient number, since it is larger than the sum of its proper divisors (24048962331).

312636510121 is a wasteful number, since it uses less digits than its factorization.

312636510121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24048962330.

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 312636510121 in words is "three hundred twelve billion, six hundred thirty-six million, five hundred ten thousand, one hundred twenty-one".