12402251 has 2 divisors, whose sum is σ = 12402252. Its totient is φ = 12402250.

The previous prime is 12402241. The next prime is 12402253. The reversal of 12402251 is 15220421.

It is a strong prime.

It is an emirp because it is prime and its reverse (15220421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12402251 is a prime.

It is a Sophie Germain prime.

Together with 12402253, 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 (12402253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6201125 + 6201126.

It is an arithmetic number, because the mean of its divisors is an integer number (6201126).

Almost surely, 2^12402251 is an apocalyptic number.

12402251 is a deficient number, since it is larger than the sum of its proper divisors (1).

12402251 is an equidigital number, since it uses as much as digits as its factorization.

12402251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 12402251 is about 3521.6829783500. The cubic root of 12402251 is about 231.4729103578.

Adding to 12402251 its reverse (15220421), we get a palindrome (27622672).

The spelling of 12402251 in words is "twelve million, four hundred two thousand, two hundred fifty-one".