315120161 has 2 divisors, whose sum is σ = 315120162. Its totient is φ = 315120160.

The previous prime is 315120133. The next prime is 315120173. The reversal of 315120161 is 161021513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216237025 + 98883136 = 14705^2 + 9944^2 .

It is a cyclic number.

It is not a de Polignac number, because 315120161 - 2⁶ = 315120097 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (315120131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157560080 + 157560081.

It is an arithmetic number, because the mean of its divisors is an integer number (157560081).

Almost surely, 2^315120161 is an apocalyptic number.

It is an amenable number.

315120161 is a deficient number, since it is larger than the sum of its proper divisors (1).

315120161 is an equidigital number, since it uses as much as digits as its factorization.

315120161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 315120161 is about 17751.6241792124. The cubic root of 315120161 is about 680.4957176879.

Adding to 315120161 its reverse (161021513), we get a palindrome (476141674).

The spelling of 315120161 in words is "three hundred fifteen million, one hundred twenty thousand, one hundred sixty-one".