2315321317581 has 4 divisors (see below), whose sum is σ = 3087095090112. Its totient is φ = 1543547545052.

The previous prime is 2315321317511. The next prime is 2315321317607. The reversal of 2315321317581 is 1857131235132.

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.

It is a cyclic number.

It is not a de Polignac number, because 2315321317581 - 2¹⁰ = 2315321316557 is a prime.

It is a super-2 number, since 2×2315321317581² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2315321317511) 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, 385886886261 + ... + 385886886266.

It is an arithmetic number, because the mean of its divisors is an integer number (771773772528).

Almost surely, 2^{2315321317581} is an apocalyptic number.

It is an amenable number.

2315321317581 is a deficient number, since it is larger than the sum of its proper divisors (771773772531).

2315321317581 is an equidigital number, since it uses as much as digits as its factorization.

2315321317581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771773772530.

The product of its digits is 151200, while the sum is 42.

The spelling of 2315321317581 in words is "two trillion, three hundred fifteen billion, three hundred twenty-one million, three hundred seventeen thousand, five hundred eighty-one".