1251851141 has 2 divisors, whose sum is σ = 1251851142. Its totient is φ = 1251851140.

The previous prime is 1251851129. The next prime is 1251851179. The reversal of 1251851141 is 1411581521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 964413025 + 287438116 = 31055^2 + 16954^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251851141 - 2¹⁴ = 1251834757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251851191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625925570 + 625925571.

It is an arithmetic number, because the mean of its divisors is an integer number (625925571).

Almost surely, 2^1251851141 is an apocalyptic number.

It is an amenable number.

1251851141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251851141 is an equidigital number, since it uses as much as digits as its factorization.

1251851141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1600, while the sum is 29.

The square root of 1251851141 is about 35381.5084613418. The cubic root of 1251851141 is about 1077.7488377223.

The spelling of 1251851141 in words is "one billion, two hundred fifty-one million, eight hundred fifty-one thousand, one hundred forty-one".