12122639 has 2 divisors, whose sum is σ = 12122640. Its totient is φ = 12122638.

The previous prime is 12122623. The next prime is 12122641. The reversal of 12122639 is 93622121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12122639 - 2⁴ = 12122623 is a prime.

It is a super-4 number, since 4×12122639⁴ (a number of 29 digits) contains 4444 as substring.

Together with 12122641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12122659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061319 + 6061320.

It is an arithmetic number, because the mean of its divisors is an integer number (6061320).

Almost surely, 2^12122639 is an apocalyptic number.

12122639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12122639 is an equidigital number, since it uses as much as digits as its factorization.

12122639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 26.

The square root of 12122639 is about 3481.7580329483. The cubic root of 12122639 is about 229.7201321801.

The spelling of 12122639 in words is "twelve million, one hundred twenty-two thousand, six hundred thirty-nine".