318729647 has 2 divisors, whose sum is σ = 318729648. Its totient is φ = 318729646.

The previous prime is 318729629. The next prime is 318729659. The reversal of 318729647 is 746927813.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 318729647 - 2⁸ = 318729391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318729667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159364823 + 159364824.

It is an arithmetic number, because the mean of its divisors is an integer number (159364824).

Almost surely, 2^318729647 is an apocalyptic number.

318729647 is a deficient number, since it is larger than the sum of its proper divisors (1).

318729647 is an equidigital number, since it uses as much as digits as its factorization.

318729647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 47.

The square root of 318729647 is about 17853.0010642469. The cubic root of 318729647 is about 683.0840645185.

The spelling of 318729647 in words is "three hundred eighteen million, seven hundred twenty-nine thousand, six hundred forty-seven".