315744661 has 2 divisors, whose sum is σ = 315744662. Its totient is φ = 315744660.

The previous prime is 315744659. The next prime is 315744673. The reversal of 315744661 is 166447513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 301682161 + 14062500 = 17369^2 + 3750^2 .

It is an emirp because it is prime and its reverse (166447513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 315744661 - 2¹ = 315744659 is a prime.

Together with 315744659, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 315744661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315744761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157872330 + 157872331.

It is an arithmetic number, because the mean of its divisors is an integer number (157872331).

Almost surely, 2^315744661 is an apocalyptic number.

It is an amenable number.

315744661 is a deficient number, since it is larger than the sum of its proper divisors (1).

315744661 is an equidigital number, since it uses as much as digits as its factorization.

315744661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 37.

The square root of 315744661 is about 17769.2054127358. The cubic root of 315744661 is about 680.9449528309.

The spelling of 315744661 in words is "three hundred fifteen million, seven hundred forty-four thousand, six hundred sixty-one".