1244724251 has 2 divisors, whose sum is σ = 1244724252. Its totient is φ = 1244724250.

The previous prime is 1244724227. The next prime is 1244724253. The reversal of 1244724251 is 1524274421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1244724251 is a prime.

It is a super-2 number, since 2×1244724251² = 3098676922055022002, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1244724253, 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 (1244724253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622362125 + 622362126.

It is an arithmetic number, because the mean of its divisors is an integer number (622362126).

Almost surely, 2^1244724251 is an apocalyptic number.

1244724251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244724251 is an equidigital number, since it uses as much as digits as its factorization.

1244724251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17920, while the sum is 32.

The square root of 1244724251 is about 35280.6498097753. The cubic root of 1244724251 is about 1075.6997070070.

Adding to 1244724251 its reverse (1524274421), we get a palindrome (2768998672).

The spelling of 1244724251 in words is "one billion, two hundred forty-four million, seven hundred twenty-four thousand, two hundred fifty-one".