312561887 has 4 divisors (see below), whose sum is σ = 340976616. Its totient is φ = 284147160.

The previous prime is 312561877. The next prime is 312561911. The reversal of 312561887 is 788165213.

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

It is not a de Polignac number, because 312561887 - 2²⁸ = 44126431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312561877) 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, 14207348 + ... + 14207369.

It is an arithmetic number, because the mean of its divisors is an integer number (85244154).

Almost surely, 2^312561887 is an apocalyptic number.

312561887 is a deficient number, since it is larger than the sum of its proper divisors (28414729).

312561887 is a wasteful number, since it uses less digits than its factorization.

312561887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28414728.

The product of its digits is 80640, while the sum is 41.

The square root of 312561887 is about 17679.4198717039. The cubic root of 312561887 is about 678.6491977687.

The spelling of 312561887 in words is "three hundred twelve million, five hundred sixty-one thousand, eight hundred eighty-seven".