12399251 has 2 divisors, whose sum is σ = 12399252. Its totient is φ = 12399250.

The previous prime is 12399199. The next prime is 12399253. The reversal of 12399251 is 15299321.

It is a strong prime.

It is an emirp because it is prime and its reverse (15299321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12399251 is a prime.

It is a super-2 number, since 2×12399251² = 307482850722002, which contains 22 as substring.

Together with 12399253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12399253) 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, 6199625 + 6199626.

It is an arithmetic number, because the mean of its divisors is an integer number (6199626).

Almost surely, 2^12399251 is an apocalyptic number.

12399251 is a deficient number, since it is larger than the sum of its proper divisors (1).

12399251 is an equidigital number, since it uses as much as digits as its factorization.

12399251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 32.

The square root of 12399251 is about 3521.2570198723. The cubic root of 12399251 is about 231.4542450706.

The spelling of 12399251 in words is "twelve million, three hundred ninety-nine thousand, two hundred fifty-one".