312046991 has 4 divisors (see below), whose sum is σ = 312504552. Its totient is φ = 311589432.

The previous prime is 312046967. The next prime is 312046993. The reversal of 312046991 is 199640213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 312046991 - 2¹⁰ = 312045967 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 (312046993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227756 + ... + 229121.

It is an arithmetic number, because the mean of its divisors is an integer number (78126138).

Almost surely, 2^312046991 is an apocalyptic number.

312046991 is a deficient number, since it is larger than the sum of its proper divisors (457561).

312046991 is an equidigital number, since it uses as much as digits as its factorization.

312046991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457560.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 312046991 is about 17664.8518533273. The cubic root of 312046991 is about 678.2763374099.

The spelling of 312046991 in words is "three hundred twelve million, forty-six thousand, nine hundred ninety-one".