1251431427251 has 2 divisors, whose sum is σ = 1251431427252. Its totient is φ = 1251431427250.

The previous prime is 1251431427241. The next prime is 1251431427277. The reversal of 1251431427251 is 1527241341521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1251431427251 - 2¹⁰ = 1251431426227 is a prime.

It is a super-2 number, since 2×1251431427251² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1251431427241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625715713625 + 625715713626.

It is an arithmetic number, because the mean of its divisors is an integer number (625715713626).

Almost surely, 2^{1251431427251} is an apocalyptic number.

1251431427251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251431427251 is an equidigital number, since it uses as much as digits as its factorization.

1251431427251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67200, while the sum is 38.

Adding to 1251431427251 its reverse (1527241341521), we get a palindrome (2778672768772).

The spelling of 1251431427251 in words is "one trillion, two hundred fifty-one billion, four hundred thirty-one million, four hundred twenty-seven thousand, two hundred fifty-one".