12779121 has 16 divisors (see below), whose sum is σ = 18192384. Its totient is φ = 7951104.

The previous prime is 12779101. The next prime is 12779131. The reversal of 12779121 is 12197721.

12779121 = 859² + 860² + ... + 875².

It is a happy number.

It is not a de Polignac number, because 12779121 - 2⁵ = 12779089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12779101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5491 + ... + 7463.

It is an arithmetic number, because the mean of its divisors is an integer number (1137024).

Almost surely, 2^12779121 is an apocalyptic number.

It is an amenable number.

12779121 is a deficient number, since it is larger than the sum of its proper divisors (5413263).

12779121 is a wasteful number, since it uses less digits than its factorization.

12779121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120.

The product of its digits is 1764, while the sum is 30.

The square root of 12779121 is about 3574.7896441609. The cubic root of 12779121 is about 233.7941611589.

The spelling of 12779121 in words is "twelve million, seven hundred seventy-nine thousand, one hundred twenty-one".