315552661 has 2 divisors, whose sum is σ = 315552662. Its totient is φ = 315552660.

The previous prime is 315552659. The next prime is 315552673. The reversal of 315552661 is 166255513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201810436 + 113742225 = 14206^2 + 10665^2 .

It is an emirp because it is prime and its reverse (166255513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 315552661 - 2¹ = 315552659 is a prime.

Together with 315552659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315550661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157776330 + 157776331.

It is an arithmetic number, because the mean of its divisors is an integer number (157776331).

Almost surely, 2^315552661 is an apocalyptic number.

It is an amenable number.

315552661 is a deficient number, since it is larger than the sum of its proper divisors (1).

315552661 is an equidigital number, since it uses as much as digits as its factorization.

315552661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27000, while the sum is 34.

The square root of 315552661 is about 17763.8019860614. The cubic root of 315552661 is about 680.8069004142.

The spelling of 315552661 in words is "three hundred fifteen million, five hundred fifty-two thousand, six hundred sixty-one".