247320317 has 2 divisors, whose sum is σ = 247320318. Its totient is φ = 247320316.

The previous prime is 247320289. The next prime is 247320341. The reversal of 247320317 is 713023742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 240529081 + 6791236 = 15509^2 + 2606^2 .

It is a cyclic number.

It is not a de Polignac number, because 247320317 - 2⁶ = 247320253 is a prime.

It is a super-2 number, since 2×247320317² = 122334678401960978, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 247320317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247320347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123660158 + 123660159.

It is an arithmetic number, because the mean of its divisors is an integer number (123660159).

Almost surely, 2^247320317 is an apocalyptic number.

It is an amenable number.

247320317 is a deficient number, since it is larger than the sum of its proper divisors (1).

247320317 is an equidigital number, since it uses as much as digits as its factorization.

247320317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 29.

The square root of 247320317 is about 15726.4209850811. The cubic root of 247320317 is about 627.7016421540.

The spelling of 247320317 in words is "two hundred forty-seven million, three hundred twenty thousand, three hundred seventeen".