313565621 has 4 divisors (see below), whose sum is σ = 316340652. Its totient is φ = 310790592.

The previous prime is 313565599. The next prime is 313565627. The reversal of 313565621 is 126565313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4157521 + 309408100 = 2039^2 + 17590^2 .

It is a cyclic number.

It is not a de Polignac number, because 313565621 - 2¹⁸ = 313303477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313565627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1387346 + ... + 1387571.

It is an arithmetic number, because the mean of its divisors is an integer number (79085163).

Almost surely, 2^313565621 is an apocalyptic number.

It is an amenable number.

313565621 is a deficient number, since it is larger than the sum of its proper divisors (2775031).

313565621 is a wasteful number, since it uses less digits than its factorization.

313565621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2775030.

The product of its digits is 16200, while the sum is 32.

The square root of 313565621 is about 17707.7841922698. The cubic root of 313565621 is about 679.3748731587.

The spelling of 313565621 in words is "three hundred thirteen million, five hundred sixty-five thousand, six hundred twenty-one".