312161605 has 12 divisors (see below), whose sum is σ = 435752460. Its totient is φ = 214053504.

The previous prime is 312161593. The next prime is 312161611. The reversal of 312161605 is 506161213.

It can be written as a sum of positive squares in 2 ways, for example, as 44315649 + 267845956 = 6657^2 + 16366^2 .

It is not a de Polignac number, because 312161605 - 2⁷ = 312161477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 312161605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 636820 + ... + 637309.

It is an arithmetic number, because the mean of its divisors is an integer number (36312705).

Almost surely, 2^312161605 is an apocalyptic number.

312161605 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

312161605 is a deficient number, since it is larger than the sum of its proper divisors (123590855).

312161605 is a wasteful number, since it uses less digits than its factorization.

312161605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274148 (or 1274141 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 312161605 is about 17668.0956811989. The cubic root of 312161605 is about 678.3593702548.

The spelling of 312161605 in words is "three hundred twelve million, one hundred sixty-one thousand, six hundred five".