315423121 has 6 divisors (see below), whose sum is σ = 341553030. Its totient is φ = 291159648.

The previous prime is 315423107. The next prime is 315423139. The reversal of 315423121 is 121324513.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 3370896 + 312052225 = 1836^2 + 17665^2 .

It is not a de Polignac number, because 315423121 - 2⁷ = 315422993 is a prime.

It is a super-2 number, since 2×315423121² = 198983490522761282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 315423092 and 315423101.

It is not an unprimeable number, because it can be changed into a prime (315423191) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 933036 + ... + 933373.

It is an arithmetic number, because the mean of its divisors is an integer number (56925505).

Almost surely, 2^315423121 is an apocalyptic number.

It is an amenable number.

315423121 is a deficient number, since it is larger than the sum of its proper divisors (26129909).

315423121 is a wasteful number, since it uses less digits than its factorization.

315423121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866435 (or 1866422 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 315423121 is about 17760.1554328784. The cubic root of 315423121 is about 680.7137265348.

Adding to 315423121 its reverse (121324513), we get a palindrome (436747634).

It can be divided in two parts, 315423 and 121, that multiplied together give a palindrome (38166183).

The spelling of 315423121 in words is "three hundred fifteen million, four hundred twenty-three thousand, one hundred twenty-one".