1251420143 has 2 divisors, whose sum is σ = 1251420144. Its totient is φ = 1251420142.

The previous prime is 1251420097. The next prime is 1251420169. The reversal of 1251420143 is 3410241521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1251420143 - 2⁸ = 1251419887 is a prime.

It is a super-2 number, since 2×1251420143² = 3132104748612280898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251420173) 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, 625710071 + 625710072.

It is an arithmetic number, because the mean of its divisors is an integer number (625710072).

Almost surely, 2^1251420143 is an apocalyptic number.

1251420143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251420143 is an equidigital number, since it uses as much as digits as its factorization.

1251420143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1251420143 is about 35375.4172130874. The cubic root of 1251420143 is about 1077.6251380009.

Adding to 1251420143 its reverse (3410241521), we get a palindrome (4661661664).

The spelling of 1251420143 in words is "one billion, two hundred fifty-one million, four hundred twenty thousand, one hundred forty-three".