313516561 has 4 divisors (see below), whose sum is σ = 313945012. Its totient is φ = 313088112.

The previous prime is 313516559. The next prime is 313516573. The reversal of 313516561 is 165615313.

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 311734336 + 1782225 = 17656^2 + 1335^2 .

It is a cyclic number.

It is not a de Polignac number, because 313516561 - 2¹ = 313516559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (313513561) 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, 213126 + ... + 214591.

It is an arithmetic number, because the mean of its divisors is an integer number (78486253).

Almost surely, 2^313516561 is an apocalyptic number.

It is an amenable number.

313516561 is a deficient number, since it is larger than the sum of its proper divisors (428451).

313516561 is an equidigital number, since it uses as much as digits as its factorization.

313516561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428450.

The product of its digits is 8100, while the sum is 31.

The square root of 313516561 is about 17706.3988715944. The cubic root of 313516561 is about 679.3394399911.

The spelling of 313516561 in words is "three hundred thirteen million, five hundred sixteen thousand, five hundred sixty-one".