12779591 has 4 divisors (see below), whose sum is σ = 13941384. Its totient is φ = 11617800.

The previous prime is 12779573. The next prime is 12779621. The reversal of 12779591 is 19597721.

It is a happy number.

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 12779591 - 2¹⁴ = 12763207 is a prime.

It is a super-2 number, since 2×12779591² = 326635892254562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12779531) 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, 580880 + ... + 580901.

It is an arithmetic number, because the mean of its divisors is an integer number (3485346).

Almost surely, 2^12779591 is an apocalyptic number.

12779591 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12779591 is a deficient number, since it is larger than the sum of its proper divisors (1161793).

12779591 is a wasteful number, since it uses less digits than its factorization.

12779591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161792.

The product of its digits is 39690, while the sum is 41.

The square root of 12779591 is about 3574.8553816903. The cubic root of 12779591 is about 233.7970273421.

The spelling of 12779591 in words is "twelve million, seven hundred seventy-nine thousand, five hundred ninety-one".