12620651 has 4 divisors (see below), whose sum is σ = 12650232. Its totient is φ = 12591072.

The previous prime is 12620633. The next prime is 12620653. The reversal of 12620651 is 15602621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12620651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12620653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14141 + ... + 15006.

It is an arithmetic number, because the mean of its divisors is an integer number (3162558).

Almost surely, 2^12620651 is an apocalyptic number.

12620651 is a deficient number, since it is larger than the sum of its proper divisors (29581).

12620651 is an equidigital number, since it uses as much as digits as its factorization.

12620651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29580.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 12620651 is about 3552.5555590307. Note that the first 5 decimals coincide. The cubic root of 12620651 is about 232.8237352445.

The spelling of 12620651 in words is "twelve million, six hundred twenty thousand, six hundred fifty-one".