115813221 has 8 divisors (see below), whose sum is σ = 154470144. Its totient is φ = 77182560.

The previous prime is 115813199. The next prime is 115813223. The reversal of 115813221 is 122318511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 115813221 - 2¹⁰ = 115812197 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 115813191 and 115813200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115813223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9001 + ... + 17681.

It is an arithmetic number, because the mean of its divisors is an integer number (19308768).

Almost surely, 2^115813221 is an apocalyptic number.

It is an amenable number.

115813221 is a deficient number, since it is larger than the sum of its proper divisors (38656923).

115813221 is an equidigital number, since it uses as much as digits as its factorization.

115813221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13131.

The product of its digits is 480, while the sum is 24.

The square root of 115813221 is about 10761.6551236322. The cubic root of 115813221 is about 487.4379965851.

The spelling of 115813221 in words is "one hundred fifteen million, eight hundred thirteen thousand, two hundred twenty-one".