312680891 has 4 divisors (see below), whose sum is σ = 329137800. Its totient is φ = 296223984.

The previous prime is 312680873. The next prime is 312680897. The reversal of 312680891 is 198086213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198086213 = 13 ⋅15237401.

It is not a de Polignac number, because 312680891 - 2²⁶ = 245572027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312680897) 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, 8228426 + ... + 8228463.

It is an arithmetic number, because the mean of its divisors is an integer number (82284450).

Almost surely, 2^312680891 is an apocalyptic number.

312680891 is a deficient number, since it is larger than the sum of its proper divisors (16456909).

312680891 is a wasteful number, since it uses less digits than its factorization.

312680891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16456908.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 312680891 is about 17682.7851595839. The cubic root of 312680891 is about 678.7353158837.

The spelling of 312680891 in words is "three hundred twelve million, six hundred eighty thousand, eight hundred ninety-one".