312711961 has 4 divisors (see below), whose sum is σ = 320339124. Its totient is φ = 305084800.

The previous prime is 312711947. The next prime is 312711989. The reversal of 312711961 is 169117213.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20985561 + 291726400 = 4581^2 + 17080^2 .

It is a cyclic number.

It is not a de Polignac number, because 312711961 - 2⁵ = 312711929 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312711461) 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, 3813520 + ... + 3813601.

It is an arithmetic number, because the mean of its divisors is an integer number (80084781).

Almost surely, 2^312711961 is an apocalyptic number.

It is an amenable number.

312711961 is a deficient number, since it is larger than the sum of its proper divisors (7627163).

312711961 is an equidigital number, since it uses as much as digits as its factorization.

312711961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7627162.

The product of its digits is 2268, while the sum is 31.

The square root of 312711961 is about 17683.6636758337. The cubic root of 312711961 is about 678.7577963192.

The spelling of 312711961 in words is "three hundred twelve million, seven hundred eleven thousand, nine hundred sixty-one".