115891481 has 2 divisors, whose sum is σ = 115891482. Its totient is φ = 115891480.

The previous prime is 115891463. The next prime is 115891483. The reversal of 115891481 is 184198511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66667225 + 49224256 = 8165^2 + 7016^2 .

It is a cyclic number.

It is not a de Polignac number, because 115891481 - 2⁶ = 115891417 is a prime.

It is a super-2 number, since 2×115891481² = 26861670736746722, which contains 22 as substring.

Together with 115891483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (115891483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57945740 + 57945741.

It is an arithmetic number, because the mean of its divisors is an integer number (57945741).

Almost surely, 2^115891481 is an apocalyptic number.

It is an amenable number.

115891481 is a deficient number, since it is larger than the sum of its proper divisors (1).

115891481 is an equidigital number, since it uses as much as digits as its factorization.

115891481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 38.

The square root of 115891481 is about 10765.2905673744. The cubic root of 115891481 is about 487.5477661721.

The spelling of 115891481 in words is "one hundred fifteen million, eight hundred ninety-one thousand, four hundred eighty-one".