12136639 has 2 divisors, whose sum is σ = 12136640. Its totient is φ = 12136638.

The previous prime is 12136633. The next prime is 12136643. The reversal of 12136639 is 93663121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12136639 - 2⁹ = 12136127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12136639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12136633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6068319 + 6068320.

It is an arithmetic number, because the mean of its divisors is an integer number (6068320).

Almost surely, 2^12136639 is an apocalyptic number.

12136639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12136639 is an equidigital number, since it uses as much as digits as its factorization.

12136639 is an evil number, because the sum of its binary digits is even.

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

The square root of 12136639 is about 3483.7679314214. The cubic root of 12136639 is about 229.8085300006.

The spelling of 12136639 in words is "twelve million, one hundred thirty-six thousand, six hundred thirty-nine".