115617729 has 4 divisors (see below), whose sum is σ = 154156976. Its totient is φ = 77078484.

The previous prime is 115617727. The next prime is 115617739. The reversal of 115617729 is 927716511.

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: 927716511 = 3 ⋅309238837.

It is not a de Polignac number, because 115617729 - 2¹ = 115617727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115617721) 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, 19269619 + ... + 19269624.

It is an arithmetic number, because the mean of its divisors is an integer number (38539244).

Almost surely, 2^115617729 is an apocalyptic number.

It is an amenable number.

115617729 is a deficient number, since it is larger than the sum of its proper divisors (38539247).

115617729 is an equidigital number, since it uses as much as digits as its factorization.

115617729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38539246.

The product of its digits is 26460, while the sum is 39.

The square root of 115617729 is about 10752.5684838554. The cubic root of 115617729 is about 487.1635780147.

The spelling of 115617729 in words is "one hundred fifteen million, six hundred seventeen thousand, seven hundred twenty-nine".