12521239 has 2 divisors, whose sum is σ = 12521240. Its totient is φ = 12521238.

The previous prime is 12521233. The next prime is 12521291. The reversal of 12521239 is 93212521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12521239 - 2²¹ = 10424087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12521233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6260619 + 6260620.

It is an arithmetic number, because the mean of its divisors is an integer number (6260620).

Almost surely, 2^12521239 is an apocalyptic number.

12521239 is a deficient number, since it is larger than the sum of its proper divisors (1).

12521239 is an equidigital number, since it uses as much as digits as its factorization.

12521239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 25.

The square root of 12521239 is about 3538.5362793110. The cubic root of 12521239 is about 232.2108109117.

The spelling of 12521239 in words is "twelve million, five hundred twenty-one thousand, two hundred thirty-nine".