312879991 has 2 divisors, whose sum is σ = 312879992. Its totient is φ = 312879990.

The previous prime is 312879961. The next prime is 312880027. The reversal of 312879991 is 199978213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312879991 - 2¹³ = 312871799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312879901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156439995 + 156439996.

It is an arithmetic number, because the mean of its divisors is an integer number (156439996).

Almost surely, 2^312879991 is an apocalyptic number.

312879991 is a deficient number, since it is larger than the sum of its proper divisors (1).

312879991 is an equidigital number, since it uses as much as digits as its factorization.

312879991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 49.

The square root of 312879991 is about 17688.4140329200. The cubic root of 312879991 is about 678.8793472084.

The spelling of 312879991 in words is "three hundred twelve million, eight hundred seventy-nine thousand, nine hundred ninety-one".