115003991 has 2 divisors, whose sum is σ = 115003992. Its totient is φ = 115003990.

The previous prime is 115003949. The next prime is 115004003. The reversal of 115003991 is 199300511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 115003991 - 2⁶ = 115003927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115005991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57501995 + 57501996.

It is an arithmetic number, because the mean of its divisors is an integer number (57501996).

Almost surely, 2^115003991 is an apocalyptic number.

115003991 is a deficient number, since it is larger than the sum of its proper divisors (1).

115003991 is an equidigital number, since it uses as much as digits as its factorization.

115003991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1215, while the sum is 29.

The square root of 115003991 is about 10723.9913744837. The cubic root of 115003991 is about 486.3000385545.

The spelling of 115003991 in words is "one hundred fifteen million, three thousand, nine hundred ninety-one".