12251909 has 2 divisors, whose sum is σ = 12251910. Its totient is φ = 12251908.

The previous prime is 12251887. The next prime is 12251929. The reversal of 12251909 is 90915221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11730625 + 521284 = 3425^2 + 722^2 .

It is an emirp because it is prime and its reverse (90915221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12251909 - 2⁸ = 12251653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12251929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6125954 + 6125955.

It is an arithmetic number, because the mean of its divisors is an integer number (6125955).

Almost surely, 2^12251909 is an apocalyptic number.

It is an amenable number.

12251909 is a deficient number, since it is larger than the sum of its proper divisors (1).

12251909 is an equidigital number, since it uses as much as digits as its factorization.

12251909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 12251909 is about 3500.2727036618. The cubic root of 12251909 is about 230.5337885699.

The spelling of 12251909 in words is "twelve million, two hundred fifty-one thousand, nine hundred nine".