312315881 has 4 divisors (see below), whose sum is σ = 313934292. Its totient is φ = 310697472.

The previous prime is 312315859. The next prime is 312315889. The reversal of 312315881 is 188513213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 188513213 = 7 ⋅26930459.

It can be written as a sum of positive squares in 2 ways, for example, as 28090000 + 284225881 = 5300^2 + 16859^2 .

It is a cyclic number.

It is not a de Polignac number, because 312315881 - 2¹⁰ = 312314857 is a prime.

It is a super-2 number, since 2×312315881² = 195082419049612322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312315889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808916 + ... + 809301.

It is an arithmetic number, because the mean of its divisors is an integer number (78483573).

Almost surely, 2^312315881 is an apocalyptic number.

It is an amenable number.

312315881 is a deficient number, since it is larger than the sum of its proper divisors (1618411).

312315881 is a wasteful number, since it uses less digits than its factorization.

312315881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618410.

The product of its digits is 5760, while the sum is 32.

The square root of 312315881 is about 17672.4610906348. The cubic root of 312315881 is about 678.4711044042.

The spelling of 312315881 in words is "three hundred twelve million, three hundred fifteen thousand, eight hundred eighty-one".