115316821 has 4 divisors (see below), whose sum is σ = 115755552. Its totient is φ = 114878092.

The previous prime is 115316819. The next prime is 115316863. The reversal of 115316821 is 128613511.

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.

It is a cyclic number.

It is not a de Polignac number, because 115316821 - 2¹ = 115316819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 115316821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115316891) 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, 218971 + ... + 219496.

It is an arithmetic number, because the mean of its divisors is an integer number (28938888).

Almost surely, 2^115316821 is an apocalyptic number.

It is an amenable number.

115316821 is a deficient number, since it is larger than the sum of its proper divisors (438731).

115316821 is an equidigital number, since it uses as much as digits as its factorization.

115316821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438730.

The product of its digits is 1440, while the sum is 28.

The square root of 115316821 is about 10738.5669900597. The cubic root of 115316821 is about 486.7405783678.

The spelling of 115316821 in words is "one hundred fifteen million, three hundred sixteen thousand, eight hundred twenty-one".