312001391 has 16 divisors (see below), whose sum is σ = 367250688. Its totient is φ = 262310400.

The previous prime is 312001387. The next prime is 312001409. The reversal of 312001391 is 193100213.

It is a cyclic number.

It is not a de Polignac number, because 312001391 - 2² = 312001387 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 (312001321) 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, 15920 + ... + 29621.

It is an arithmetic number, because the mean of its divisors is an integer number (22953168).

Almost surely, 2^312001391 is an apocalyptic number.

312001391 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

312001391 is a deficient number, since it is larger than the sum of its proper divisors (55249297).

312001391 is a wasteful number, since it uses less digits than its factorization.

312001391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45602.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 312001391 is about 17663.5611075457. The cubic root of 312001391 is about 678.2432965447.

The spelling of 312001391 in words is "three hundred twelve million, one thousand, three hundred ninety-one".