312011997 has 16 divisors (see below), whose sum is σ = 473568768. Its totient is φ = 180876080.

The previous prime is 312011983. The next prime is 312012013. The reversal of 312011997 is 799110213.

It is not a de Polignac number, because 312011997 - 2¹¹ = 312009949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312010997) 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, 204783 + ... + 206300.

It is an arithmetic number, because the mean of its divisors is an integer number (29598048).

Almost surely, 2^312011997 is an apocalyptic number.

It is an amenable number.

312011997 is a deficient number, since it is larger than the sum of its proper divisors (161556771).

312011997 is a wasteful number, since it uses less digits than its factorization.

312011997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411120.

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 312011997 is about 17663.8613275807. The cubic root of 312011997 is about 678.2509817315.

The spelling of 312011997 in words is "three hundred twelve million, eleven thousand, nine hundred ninety-seven".