316636561 has 4 divisors (see below), whose sum is σ = 330403392. Its totient is φ = 302869732.

The previous prime is 316636549. The next prime is 316636583. The reversal of 316636561 is 165636613.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 316636561 - 2¹⁹ = 316112273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 316636561.

It is not an unprimeable number, because it can be changed into a prime (316636361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6883381 + ... + 6883426.

It is an arithmetic number, because the mean of its divisors is an integer number (82600848).

Almost surely, 2^316636561 is an apocalyptic number.

It is an amenable number.

316636561 is a deficient number, since it is larger than the sum of its proper divisors (13766831).

316636561 is a wasteful number, since it uses less digits than its factorization.

316636561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13766830.

The product of its digits is 58320, while the sum is 37.

The square root of 316636561 is about 17794.2845037388. The cubic root of 316636561 is about 681.5855166764.

The spelling of 316636561 in words is "three hundred sixteen million, six hundred thirty-six thousand, five hundred sixty-one".