12613639 has 2 divisors, whose sum is σ = 12613640. Its totient is φ = 12613638.

The previous prime is 12613631. The next prime is 12613661. The reversal of 12613639 is 93631621.

It is a weak prime.

It is an emirp because it is prime and its reverse (93631621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12613639 - 2³ = 12613631 is a prime.

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 12613639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12613631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6306819 + 6306820.

It is an arithmetic number, because the mean of its divisors is an integer number (6306820).

Almost surely, 2^12613639 is an apocalyptic number.

12613639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12613639 is an equidigital number, since it uses as much as digits as its factorization.

12613639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 31.

The square root of 12613639 is about 3551.5685267217. The cubic root of 12613639 is about 232.7806085079.

It can be divided in two parts, 1261 and 3639, that added together give a square (4900 = 70²).

The spelling of 12613639 in words is "twelve million, six hundred thirteen thousand, six hundred thirty-nine".