115438991 has 2 divisors, whose sum is σ = 115438992. Its totient is φ = 115438990.

The previous prime is 115438979. The next prime is 115439039. The reversal of 115438991 is 199834511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 115438991 - 2¹⁰ = 115437967 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115438951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57719495 + 57719496.

It is an arithmetic number, because the mean of its divisors is an integer number (57719496).

Almost surely, 2^115438991 is an apocalyptic number.

115438991 is a deficient number, since it is larger than the sum of its proper divisors (1).

115438991 is an equidigital number, since it uses as much as digits as its factorization.

115438991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 41.

The square root of 115438991 is about 10744.2538596219. The cubic root of 115438991 is about 486.9124067522.

The spelling of 115438991 in words is "one hundred fifteen million, four hundred thirty-eight thousand, nine hundred ninety-one".