312312131 has 4 divisors (see below), whose sum is σ = 317432064. Its totient is φ = 307192200.

The previous prime is 312312103. The next prime is 312312157. The reversal of 312312131 is 131213213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131213213 = 53 ⋅2475721.

It is a cyclic number.

It is not a de Polignac number, because 312312131 - 2⁶ = 312312067 is a prime.

It is a super-2 number, since 2×312312131² = 195077734339522322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312318131) 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, 2559875 + ... + 2559996.

It is an arithmetic number, because the mean of its divisors is an integer number (79358016).

Almost surely, 2^312312131 is an apocalyptic number.

312312131 is a deficient number, since it is larger than the sum of its proper divisors (5119933).

312312131 is an equidigital number, since it uses as much as digits as its factorization.

312312131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5119932.

The product of its digits is 108, while the sum is 17.

The square root of 312312131 is about 17672.3549930393. The cubic root of 312312131 is about 678.4683889090.

Adding to 312312131 its reverse (131213213), we get a palindrome (443525344).

The spelling of 312312131 in words is "three hundred twelve million, three hundred twelve thousand, one hundred thirty-one".