115409021 has 16 divisors (see below), whose sum is σ = 149520000. Its totient is φ = 86505408.

The previous prime is 115408999. The next prime is 115409027. The reversal of 115409021 is 120904511.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 115409021 - 2²⁶ = 48300157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115409027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31646 + ... + 35103.

It is an arithmetic number, because the mean of its divisors is an integer number (9345000).

Almost surely, 2^115409021 is an apocalyptic number.

It is an amenable number.

115409021 is a deficient number, since it is larger than the sum of its proper divisors (34110979).

115409021 is a wasteful number, since it uses less digits than its factorization.

115409021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66788.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 115409021 is about 10742.8590700986. The cubic root of 115409021 is about 486.8702660863.

The spelling of 115409021 in words is "one hundred fifteen million, four hundred nine thousand, twenty-one".