315031121 has 4 divisors (see below), whose sum is σ = 315545652. Its totient is φ = 314516592.

The previous prime is 315031117. The next prime is 315031169. The reversal of 315031121 is 121130513.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 120121600 + 194909521 = 10960^2 + 13961^2 .

It is a cyclic number.

It is not a de Polignac number, because 315031121 - 2² = 315031117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 315031121.

It is not an unprimeable number, because it can be changed into a prime (315031181) 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, 256346 + ... + 257571.

It is an arithmetic number, because the mean of its divisors is an integer number (78886413).

Almost surely, 2^315031121 is an apocalyptic number.

It is an amenable number.

315031121 is a deficient number, since it is larger than the sum of its proper divisors (514531).

315031121 is an equidigital number, since it uses as much as digits as its factorization.

315031121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514530.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 315031121 is about 17749.1160624973. The cubic root of 315031121 is about 680.4316182808.

Adding to 315031121 its reverse (121130513), we get a palindrome (436161634).

The spelling of 315031121 in words is "three hundred fifteen million, thirty-one thousand, one hundred twenty-one".