315121115516131 has 4 divisors (see below), whose sum is σ = 315127433530512. Its totient is φ = 315114797501752.

The previous prime is 315121115516099. The next prime is 315121115516173. The reversal of 315121115516131 is 131615511121513.

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

It is a cyclic number.

It is not a de Polignac number, because 315121115516131 - 2⁵ = 315121115516099 is a prime.

It is a super-2 number, since 2×315121115516131² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315121115556131) 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, 3158932375 + ... + 3159032128.

It is an arithmetic number, because the mean of its divisors is an integer number (78781858382628).

Almost surely, 2^{315121115516131} is an apocalyptic number.

315121115516131 is a deficient number, since it is larger than the sum of its proper divisors (6318014381).

315121115516131 is an equidigital number, since it uses as much as digits as its factorization.

315121115516131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6318014380.

The product of its digits is 13500, while the sum is 37.

Adding to 315121115516131 its reverse (131615511121513), we get a palindrome (446736626637644).

The spelling of 315121115516131 in words is "three hundred fifteen trillion, one hundred twenty-one billion, one hundred fifteen million, five hundred sixteen thousand, one hundred thirty-one".