115536721 has 4 divisors (see below), whose sum is σ = 119263744. Its totient is φ = 111809700.

The previous prime is 115536679. The next prime is 115536761. The reversal of 115536721 is 127635511.

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 115536721 - 2¹⁹ = 115012433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 3726991 = 115536721 / (1 + 1 + 5 + 5 + 3 + 6 + 7 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115536761) 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, 1863465 + ... + 1863526.

It is an arithmetic number, because the mean of its divisors is an integer number (29815936).

Almost surely, 2^115536721 is an apocalyptic number.

It is an amenable number.

115536721 is a deficient number, since it is larger than the sum of its proper divisors (3727023).

115536721 is an equidigital number, since it uses as much as digits as its factorization.

115536721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3727022.

The product of its digits is 6300, while the sum is 31.

The square root of 115536721 is about 10748.8009098690. The cubic root of 115536721 is about 487.0497737624.

The spelling of 115536721 in words is "one hundred fifteen million, five hundred thirty-six thousand, seven hundred twenty-one".