315261493 has 2 divisors, whose sum is σ = 315261494. Its totient is φ = 315261492.

The previous prime is 315261491. The next prime is 315261563. The reversal of 315261493 is 394162513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 287404209 + 27857284 = 16953^2 + 5278^2 .

It is a cyclic number.

It is not a de Polignac number, because 315261493 - 2¹ = 315261491 is a prime.

Together with 315261491, 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 (315261491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157630746 + 157630747.

It is an arithmetic number, because the mean of its divisors is an integer number (157630747).

Almost surely, 2^315261493 is an apocalyptic number.

It is an amenable number.

315261493 is a deficient number, since it is larger than the sum of its proper divisors (1).

315261493 is an equidigital number, since it uses as much as digits as its factorization.

315261493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 34.

The square root of 315261493 is about 17755.6045518028. The cubic root of 315261493 is about 680.5974370296.

The spelling of 315261493 in words is "three hundred fifteen million, two hundred sixty-one thousand, four hundred ninety-three".