115921919 has 2 divisors, whose sum is σ = 115921920. Its totient is φ = 115921918.

The previous prime is 115921879. The next prime is 115921933. The reversal of 115921919 is 919129511.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115921919 is a prime.

It is a super-2 number, since 2×115921919² = 26875782609285122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115921019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57960959 + 57960960.

It is an arithmetic number, because the mean of its divisors is an integer number (57960960).

Almost surely, 2^115921919 is an apocalyptic number.

115921919 is a deficient number, since it is larger than the sum of its proper divisors (1).

115921919 is an equidigital number, since it uses as much as digits as its factorization.

115921919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7290, while the sum is 38.

The square root of 115921919 is about 10766.7041846612. The cubic root of 115921919 is about 487.5904459842.

The spelling of 115921919 in words is "one hundred fifteen million, nine hundred twenty-one thousand, nine hundred nineteen".