12779551 has 4 divisors (see below), whose sum is σ = 12802504. Its totient is φ = 12756600.

The previous prime is 12779539. The next prime is 12779567. The reversal of 12779551 is 15597721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15597721 = 17 ⋅917513.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12779551 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 12779551.

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, 10620 + ... + 11761.

It is an arithmetic number, because the mean of its divisors is an integer number (3200626).

Almost surely, 2^12779551 is an apocalyptic number.

12779551 is a deficient number, since it is larger than the sum of its proper divisors (22953).

12779551 is an equidigital number, since it uses as much as digits as its factorization.

12779551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22952.

The product of its digits is 22050, while the sum is 37.

The square root of 12779551 is about 3574.8497870540. The cubic root of 12779551 is about 233.7967834144.

The spelling of 12779551 in words is "twelve million, seven hundred seventy-nine thousand, five hundred fifty-one".