315636661 has 2 divisors, whose sum is σ = 315636662. Its totient is φ = 315636660.

The previous prime is 315636619. The next prime is 315636697. The reversal of 315636661 is 166636513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 246647025 + 68989636 = 15705^2 + 8306^2 .

It is an emirp because it is prime and its reverse (166636513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 315636661 - 2⁷ = 315636533 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 315636661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315636611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157818330 + 157818331.

It is an arithmetic number, because the mean of its divisors is an integer number (157818331).

Almost surely, 2^315636661 is an apocalyptic number.

It is an amenable number.

315636661 is a deficient number, since it is larger than the sum of its proper divisors (1).

315636661 is an equidigital number, since it uses as much as digits as its factorization.

315636661 is an odious number, because the sum of its binary digits is odd.

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

The square root of 315636661 is about 17766.1661874474. The cubic root of 315636661 is about 680.8673052351.

The spelling of 315636661 in words is "three hundred fifteen million, six hundred thirty-six thousand, six hundred sixty-one".