315961 has 2 divisors, whose sum is σ = 315962. Its totient is φ = 315960.

The previous prime is 315949. The next prime is 315967. The reversal of 315961 is 169513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189225 + 126736 = 435^2 + 356^2 .

It is a cyclic number.

It is not a de Polignac number, because 315961 - 2⁹ = 315449 is a prime.

It is not a weakly prime, because it can be changed into another prime (315967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157980 + 157981.

It is an arithmetic number, because the mean of its divisors is an integer number (157981).

2³¹⁵⁹⁶¹ is an apocalyptic number.

It is an amenable number.

315961 is a deficient number, since it is larger than the sum of its proper divisors (1).

315961 is an equidigital number, since it uses as much as digits as its factorization.

315961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810, while the sum is 25.

The square root of 315961 is about 562.1040828886. The cubic root of 315961 is about 68.1100438508.

The spelling of 315961 in words is "three hundred fifteen thousand, nine hundred sixty-one".