115830821 has 6 divisors (see below), whose sum is σ = 122248422. Its totient is φ = 109734120.

The previous prime is 115830797. The next prime is 115830833. The reversal of 115830821 is 128038511.

It can be written as a sum of positive squares in only one way, i.e., 59505796 + 56325025 = 7714^2 + 7505^2 .

It is a de Polignac number, because none of the positive numbers 2^k-115830821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115830851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 160070 + ... + 160791.

It is an arithmetic number, because the mean of its divisors is an integer number (20374737).

Almost surely, 2^115830821 is an apocalyptic number.

It is an amenable number.

115830821 is a deficient number, since it is larger than the sum of its proper divisors (6417601).

115830821 is an equidigital number, since it uses as much as digits as its factorization.

115830821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320899 (or 320880 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 115830821 is about 10762.4728106509. The cubic root of 115830821 is about 487.4626871288.

The spelling of 115830821 in words is "one hundred fifteen million, eight hundred thirty thousand, eight hundred twenty-one".