115892809 has 2 divisors, whose sum is σ = 115892810. Its totient is φ = 115892808.

The previous prime is 115892801. The next prime is 115892813. The reversal of 115892809 is 908298511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115670025 + 222784 = 10755^2 + 472^2 .

It is an emirp because it is prime and its reverse (908298511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 115892809 - 2³ = 115892801 is a prime.

It is a super-2 number, since 2×115892809² = 26862286355820962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (115892801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57946404 + 57946405.

It is an arithmetic number, because the mean of its divisors is an integer number (57946405).

Almost surely, 2^115892809 is an apocalyptic number.

It is an amenable number.

115892809 is a deficient number, since it is larger than the sum of its proper divisors (1).

115892809 is an equidigital number, since it uses as much as digits as its factorization.

115892809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 43.

The square root of 115892809 is about 10765.3522469077. The cubic root of 115892809 is about 487.5496284343.

The spelling of 115892809 in words is "one hundred fifteen million, eight hundred ninety-two thousand, eight hundred nine".