2315881 has 2 divisors, whose sum is σ = 2315882. Its totient is φ = 2315880.

The previous prime is 2315861. The next prime is 2315897. The reversal of 2315881 is 1885132.

2315881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1478656 + 837225 = 1216^2 + 915^2 .

It is a cyclic number.

It is not a de Polignac number, because 2315881 - 2⁵ = 2315849 is a prime.

It is a super-2 number, since 2×2315881² = 10726609612322, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (2315861) 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 as a sum of consecutive naturals, namely, 1157940 + 1157941.

It is an arithmetic number, because the mean of its divisors is an integer number (1157941).

2^2315881 is an apocalyptic number.

It is an amenable number.

2315881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2315881 is an equidigital number, since it uses as much as digits as its factorization.

2315881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 28.

The square root of 2315881 is about 1521.8018924946. The cubic root of 2315881 is about 132.3037274418.

The spelling of 2315881 in words is "two million, three hundred fifteen thousand, eight hundred eighty-one".