318661547 has 2 divisors, whose sum is σ = 318661548. Its totient is φ = 318661546.

The previous prime is 318661529. The next prime is 318661579. The reversal of 318661547 is 745166813.

It is a weak prime.

It is an emirp because it is prime and its reverse (745166813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318661547 - 2²² = 314467243 is a prime.

It is not a weakly prime, because it can be changed into another prime (318661507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159330773 + 159330774.

It is an arithmetic number, because the mean of its divisors is an integer number (159330774).

Almost surely, 2^318661547 is an apocalyptic number.

318661547 is a deficient number, since it is larger than the sum of its proper divisors (1).

318661547 is an equidigital number, since it uses as much as digits as its factorization.

318661547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 41.

The square root of 318661547 is about 17851.0937199937. The cubic root of 318661547 is about 683.0354116464.

The spelling of 318661547 in words is "three hundred eighteen million, six hundred sixty-one thousand, five hundred forty-seven".