312515447 has 2 divisors, whose sum is σ = 312515448. Its totient is φ = 312515446.

The previous prime is 312515419. The next prime is 312515449. The reversal of 312515447 is 744515213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 312515447 - 2¹⁴ = 312499063 is a prime.

It is a super-2 number, since 2×312515447² = 195331809227219618, which contains 22 as substring.

Together with 312515449, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312515449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156257723 + 156257724.

It is an arithmetic number, because the mean of its divisors is an integer number (156257724).

Almost surely, 2^312515447 is an apocalyptic number.

312515447 is a deficient number, since it is larger than the sum of its proper divisors (1).

312515447 is an equidigital number, since it uses as much as digits as its factorization.

312515447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 32.

The square root of 312515447 is about 17678.1064314027. The cubic root of 312515447 is about 678.6155851935.

The spelling of 312515447 in words is "three hundred twelve million, five hundred fifteen thousand, four hundred forty-seven".