251224434427 has 2 divisors, whose sum is σ = 251224434428. Its totient is φ = 251224434426.

The previous prime is 251224434421. The next prime is 251224434443. The reversal of 251224434427 is 724434422152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251224434427 - 2⁷ = 251224434299 is a prime.

It is a super-2 number, since 2×251224434427² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 251224434427.

It is not a weakly prime, because it can be changed into another prime (251224434421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125612217213 + 125612217214.

It is an arithmetic number, because the mean of its divisors is an integer number (125612217214).

Almost surely, 2^251224434427 is an apocalyptic number.

251224434427 is a deficient number, since it is larger than the sum of its proper divisors (1).

251224434427 is an equidigital number, since it uses as much as digits as its factorization.

251224434427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 430080, while the sum is 40.

Adding to 251224434427 its reverse (724434422152), we get a palindrome (975658856579).

The spelling of 251224434427 in words is "two hundred fifty-one billion, two hundred twenty-four million, four hundred thirty-four thousand, four hundred twenty-seven".