315025121 has 4 divisors (see below), whose sum is σ = 315112644. Its totient is φ = 314937600.

The previous prime is 315025091. The next prime is 315025127. The reversal of 315025121 is 121520513.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121520513 = 67 ⋅1813739.

It can be written as a sum of positive squares in 2 ways, for example, as 120143521 + 194881600 = 10961^2 + 13960^2 .

It is a cyclic number.

It is not a de Polignac number, because 315025121 - 2¹⁴ = 315008737 is a prime.

It is a super-2 number, since 2×315025121² = 198481653722129282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 315025093 and 315025102.

It is not an unprimeable number, because it can be changed into a prime (315025127) 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, 38120 + ... + 45641.

It is an arithmetic number, because the mean of its divisors is an integer number (78778161).

Almost surely, 2^315025121 is an apocalyptic number.

It is an amenable number.

315025121 is a deficient number, since it is larger than the sum of its proper divisors (87523).

315025121 is an equidigital number, since it uses as much as digits as its factorization.

315025121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87522.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 315025121 is about 17748.9470391908. The cubic root of 315025121 is about 680.4272984794.

Adding to 315025121 its reverse (121520513), we get a palindrome (436545634).

The spelling of 315025121 in words is "three hundred fifteen million, twenty-five thousand, one hundred twenty-one".