312131309 has 16 divisors (see below), whose sum is σ = 362793600. Its totient is φ = 263025600.

The previous prime is 312131273. The next prime is 312131317. The reversal of 312131309 is 903131213.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312131309 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 (312131399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103862 + ... + 106824.

It is an arithmetic number, because the mean of its divisors is an integer number (22674600).

Almost surely, 2^312131309 is an apocalyptic number.

It is an amenable number.

312131309 is a deficient number, since it is larger than the sum of its proper divisors (50662291).

312131309 is a wasteful number, since it uses less digits than its factorization.

312131309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 312131309 is about 17667.2382957835. The cubic root of 312131309 is about 678.3374241004.

The spelling of 312131309 in words is "three hundred twelve million, one hundred thirty-one thousand, three hundred nine".