115800921 has 14 divisors (see below), whose sum is σ = 173623050. Its totient is φ = 77200128.

The previous prime is 115800917. The next prime is 115800941. The reversal of 115800921 is 129008511.

It can be written as a sum of positive squares in only one way, i.e., 63441225 + 52359696 = 7965^2 + 7236^2 .

It is not a de Polignac number, because 115800921 - 2² = 115800917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (115800911) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 78696 + ... + 80153.

Almost surely, 2^115800921 is an apocalyptic number.

It is an amenable number.

115800921 is a deficient number, since it is larger than the sum of its proper divisors (57822129).

115800921 is an frugal number, since it uses more digits than its factorization.

115800921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158867 (or 158852 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 115800921 is about 10761.0836350249. The cubic root of 115800921 is about 487.4207397769.

The spelling of 115800921 in words is "one hundred fifteen million, eight hundred thousand, nine hundred twenty-one".