12649979 has 2 divisors, whose sum is σ = 12649980. Its totient is φ = 12649978.

The previous prime is 12649963. The next prime is 12649993. The reversal of 12649979 is 97994621.

12649979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12649979 - 2⁴ = 12649963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12649919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6324989 + 6324990.

It is an arithmetic number, because the mean of its divisors is an integer number (6324990).

Almost surely, 2^12649979 is an apocalyptic number.

12649979 is a deficient number, since it is larger than the sum of its proper divisors (1).

12649979 is an equidigital number, since it uses as much as digits as its factorization.

12649979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 47.

The square root of 12649979 is about 3556.6808965663. The cubic root of 12649979 is about 233.0039418000.

It can be divided in two parts, 126 and 49979, that added together give a palindrome (50105).

The spelling of 12649979 in words is "twelve million, six hundred forty-nine thousand, nine hundred seventy-nine".