2315621891 has 12 divisors (see below), whose sum is σ = 2548942584. Its totient is φ = 2103514820.

The previous prime is 2315621879. The next prime is 2315621921. The reversal of 2315621891 is 1981265132.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 2315621891 - 2¹⁴ = 2315605507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2315620891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1754930 + ... + 1756248.

It is an arithmetic number, because the mean of its divisors is an integer number (212411882).

Almost surely, 2^2315621891 is an apocalyptic number.

2315621891 is a deficient number, since it is larger than the sum of its proper divisors (233320693).

2315621891 is an frugal number, since it uses more digits than its factorization.

2315621891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671 (or 1330 counting only the distinct ones).

The product of its digits is 25920, while the sum is 38.

The square root of 2315621891 is about 48120.9090832665. The cubic root of 2315621891 is about 1322.9879305399.

The spelling of 2315621891 in words is "two billion, three hundred fifteen million, six hundred twenty-one thousand, eight hundred ninety-one".