13115779 has 4 divisors (see below), whose sum is σ = 13184640. Its totient is φ = 13046920.

The previous prime is 13115747. The next prime is 13115783. The reversal of 13115779 is 97751131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13115779 - 2⁵ = 13115747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13115579) 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, 34144 + ... + 34525.

It is an arithmetic number, because the mean of its divisors is an integer number (3296160).

Almost surely, 2^13115779 is an apocalyptic number.

13115779 is a deficient number, since it is larger than the sum of its proper divisors (68861).

13115779 is an equidigital number, since it uses as much as digits as its factorization.

13115779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68860.

The product of its digits is 6615, while the sum is 34.

The square root of 13115779 is about 3621.5713440439. The cubic root of 13115779 is about 235.8294456220.

The spelling of 13115779 in words is "thirteen million, one hundred fifteen thousand, seven hundred seventy-nine".