1251249973 has 2 divisors, whose sum is σ = 1251249974. Its totient is φ = 1251249972.

The previous prime is 1251249971. The next prime is 1251250043. The reversal of 1251249973 is 3799421521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1080634129 + 170615844 = 32873^2 + 13062^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251249973 - 2¹ = 1251249971 is a prime.

Together with 1251249971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251249971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625624986 + 625624987.

It is an arithmetic number, because the mean of its divisors is an integer number (625624987).

Almost surely, 2^1251249973 is an apocalyptic number.

It is an amenable number.

1251249973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251249973 is an equidigital number, since it uses as much as digits as its factorization.

1251249973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 43.

The square root of 1251249973 is about 35373.0119300011. The cubic root of 1251249973 is about 1077.5762900891.

The spelling of 1251249973 in words is "one billion, two hundred fifty-one million, two hundred forty-nine thousand, nine hundred seventy-three".