115531939 has 2 divisors, whose sum is σ = 115531940. Its totient is φ = 115531938.

The previous prime is 115531903. The next prime is 115531943. The reversal of 115531939 is 939135511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 115531939 - 2⁷ = 115531811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 115531898 and 115531907.

It is not a weakly prime, because it can be changed into another prime (115531979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57765969 + 57765970.

It is an arithmetic number, because the mean of its divisors is an integer number (57765970).

Almost surely, 2^115531939 is an apocalyptic number.

115531939 is a deficient number, since it is larger than the sum of its proper divisors (1).

115531939 is an equidigital number, since it uses as much as digits as its factorization.

115531939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18225, while the sum is 37.

The square root of 115531939 is about 10748.5784641505. The cubic root of 115531939 is about 487.0430540975.

The spelling of 115531939 in words is "one hundred fifteen million, five hundred thirty-one thousand, nine hundred thirty-nine".