12271639 has 2 divisors, whose sum is σ = 12271640. Its totient is φ = 12271638.

The previous prime is 12271631. The next prime is 12271643. The reversal of 12271639 is 93617221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12271639 - 2³ = 12271631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12271639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12271631) 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 as a sum of consecutive naturals, namely, 6135819 + 6135820.

It is an arithmetic number, because the mean of its divisors is an integer number (6135820).

Almost surely, 2^12271639 is an apocalyptic number.

12271639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12271639 is an equidigital number, since it uses as much as digits as its factorization.

12271639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 12271639 is about 3503.0899217691. The cubic root of 12271639 is about 230.6574697663.

The spelling of 12271639 in words is "twelve million, two hundred seventy-one thousand, six hundred thirty-nine".