315561749 has 2 divisors, whose sum is σ = 315561750. Its totient is φ = 315561748.

The previous prime is 315561739. The next prime is 315561751. The reversal of 315561749 is 947165513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243141649 + 72420100 = 15593^2 + 8510^2 .

It is a cyclic number.

It is not a de Polignac number, because 315561749 - 2⁴ = 315561733 is a prime.

Together with 315561751, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315561739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157780874 + 157780875.

It is an arithmetic number, because the mean of its divisors is an integer number (157780875).

Almost surely, 2^315561749 is an apocalyptic number.

It is an amenable number.

315561749 is a deficient number, since it is larger than the sum of its proper divisors (1).

315561749 is an equidigital number, since it uses as much as digits as its factorization.

315561749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 41.

The square root of 315561749 is about 17764.0577853147. The cubic root of 315561749 is about 680.8134361576.

The spelling of 315561749 in words is "three hundred fifteen million, five hundred sixty-one thousand, seven hundred forty-nine".