315609161 has 4 divisors (see below), whose sum is σ = 360696192. Its totient is φ = 270522132.

The previous prime is 315609139. The next prime is 315609167. The reversal of 315609161 is 161906513.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 161906513 = 113 ⋅1432801.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315609161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315609167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22543505 + ... + 22543518.

It is an arithmetic number, because the mean of its divisors is an integer number (90174048).

Almost surely, 2^315609161 is an apocalyptic number.

It is an amenable number.

315609161 is a deficient number, since it is larger than the sum of its proper divisors (45087031).

315609161 is an equidigital number, since it uses as much as digits as its factorization.

315609161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45087030.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 315609161 is about 17765.3922275868. The cubic root of 315609161 is about 680.8475310274.

The spelling of 315609161 in words is "three hundred fifteen million, six hundred nine thousand, one hundred sixty-one".