115456821 has 4 divisors (see below), whose sum is σ = 153942432. Its totient is φ = 76971212.

The previous prime is 115456819. The next prime is 115456829. The reversal of 115456821 is 128654511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 128654511 = 3 ⋅42884837.

It is a cyclic number.

It is not a de Polignac number, because 115456821 - 2¹ = 115456819 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115456829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19242801 + ... + 19242806.

It is an arithmetic number, because the mean of its divisors is an integer number (38485608).

Almost surely, 2^115456821 is an apocalyptic number.

It is an amenable number.

115456821 is a deficient number, since it is larger than the sum of its proper divisors (38485611).

115456821 is an equidigital number, since it uses as much as digits as its factorization.

115456821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38485610.

The product of its digits is 9600, while the sum is 33.

The square root of 115456821 is about 10745.0835734302. The cubic root of 115456821 is about 486.9374739651.

It can be divided in two parts, 1154 and 56821, that added together give a palindrome (57975).

The spelling of 115456821 in words is "one hundred fifteen million, four hundred fifty-six thousand, eight hundred twenty-one".