312309247 has 2 divisors, whose sum is σ = 312309248. Its totient is φ = 312309246.

The previous prime is 312309233. The next prime is 312309299. The reversal of 312309247 is 742903213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312309247 - 2²⁷ = 178091519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312309947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156154623 + 156154624.

It is an arithmetic number, because the mean of its divisors is an integer number (156154624).

Almost surely, 2^312309247 is an apocalyptic number.

312309247 is a deficient number, since it is larger than the sum of its proper divisors (1).

312309247 is an equidigital number, since it uses as much as digits as its factorization.

312309247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 312309247 is about 17672.2733964818. The cubic root of 312309247 is about 678.4663004974.

The spelling of 312309247 in words is "three hundred twelve million, three hundred nine thousand, two hundred forty-seven".