312420391 has 2 divisors, whose sum is σ = 312420392. Its totient is φ = 312420390.

The previous prime is 312420389. The next prime is 312420457. The reversal of 312420391 is 193024213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312420391 - 2¹ = 312420389 is a prime.

Together with 312420389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312420331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156210195 + 156210196.

It is an arithmetic number, because the mean of its divisors is an integer number (156210196).

Almost surely, 2^312420391 is an apocalyptic number.

312420391 is a deficient number, since it is larger than the sum of its proper divisors (1).

312420391 is an equidigital number, since it uses as much as digits as its factorization.

312420391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 312420391 is about 17675.4177036923. The cubic root of 312420391 is about 678.5467747022.

The spelling of 312420391 in words is "three hundred twelve million, four hundred twenty thousand, three hundred ninety-one".