115566619 has 4 divisors (see below), whose sum is σ = 132076144. Its totient is φ = 99057096.

The previous prime is 115566613. The next prime is 115566623. The reversal of 115566619 is 916665511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 916665511 = 6491 ⋅141221.

It is a cyclic number.

It is not a de Polignac number, because 115566619 - 2⁵ = 115566587 is a prime.

It is a super-2 number, since 2×115566619² = 26711286854182322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115566613) 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, 8254752 + ... + 8254765.

It is an arithmetic number, because the mean of its divisors is an integer number (33019036).

Almost surely, 2^115566619 is an apocalyptic number.

115566619 is a deficient number, since it is larger than the sum of its proper divisors (16509525).

115566619 is an equidigital number, since it uses as much as digits as its factorization.

115566619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16509524.

The product of its digits is 48600, while the sum is 40.

The square root of 115566619 is about 10750.1915796882. The cubic root of 115566619 is about 487.0917822197.

The spelling of 115566619 in words is "one hundred fifteen million, five hundred sixty-six thousand, six hundred nineteen".