1251012871 has 2 divisors, whose sum is σ = 1251012872. Its totient is φ = 1251012870.

The previous prime is 1251012859. The next prime is 1251012907. The reversal of 1251012871 is 1782101521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1251012871 - 2⁷ = 1251012743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251012821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625506435 + 625506436.

It is an arithmetic number, because the mean of its divisors is an integer number (625506436).

Almost surely, 2^1251012871 is an apocalyptic number.

1251012871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251012871 is an equidigital number, since it uses as much as digits as its factorization.

1251012871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 28.

The square root of 1251012871 is about 35369.6603178487. The cubic root of 1251012871 is about 1077.5082217205.

The spelling of 1251012871 in words is "one billion, two hundred fifty-one million, twelve thousand, eight hundred seventy-one".