312011220131 has 4 divisors (see below), whose sum is σ = 336012083232. Its totient is φ = 288010357032.

The previous prime is 312011220127. The next prime is 312011220137. The reversal of 312011220131 is 131022110213.

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 312011220131 - 2² = 312011220127 is a prime.

It is a super-2 number, since 2×312011220131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312011220137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12000431531 + ... + 12000431556.

It is an arithmetic number, because the mean of its divisors is an integer number (84003020808).

Almost surely, 2^312011220131 is an apocalyptic number.

312011220131 is a deficient number, since it is larger than the sum of its proper divisors (24000863101).

312011220131 is a wasteful number, since it uses less digits than its factorization.

312011220131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24000863100.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 312011220131 its reverse (131022110213), we get a palindrome (443033330344).

The spelling of 312011220131 in words is "three hundred twelve billion, eleven million, two hundred twenty thousand, one hundred thirty-one".