115900409 has 2 divisors, whose sum is σ = 115900410. Its totient is φ = 115900408.

The previous prime is 115900397. The next prime is 115900439. The reversal of 115900409 is 904009511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100060009 + 15840400 = 10003^2 + 3980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115900409 is a prime.

It is not a weakly prime, because it can be changed into another prime (115900439) 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, 57950204 + 57950205.

It is an arithmetic number, because the mean of its divisors is an integer number (57950205).

Almost surely, 2^115900409 is an apocalyptic number.

It is an amenable number.

115900409 is a deficient number, since it is larger than the sum of its proper divisors (1).

115900409 is an equidigital number, since it uses as much as digits as its factorization.

115900409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 115900409 is about 10765.7052253905. The cubic root of 115900409 is about 487.5602856851.

The spelling of 115900409 in words is "one hundred fifteen million, nine hundred thousand, four hundred nine".