1251427049 has 2 divisors, whose sum is σ = 1251427050. Its totient is φ = 1251427048.

The previous prime is 1251427019. The next prime is 1251427057. The reversal of 1251427049 is 9407241521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1193011600 + 58415449 = 34540^2 + 7643^2 .

It is an emirp because it is prime and its reverse (9407241521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1251427049 - 2⁸ = 1251426793 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251427019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625713524 + 625713525.

It is an arithmetic number, because the mean of its divisors is an integer number (625713525).

Almost surely, 2^1251427049 is an apocalyptic number.

It is an amenable number.

1251427049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251427049 is an equidigital number, since it uses as much as digits as its factorization.

1251427049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 1251427049 is about 35375.5148231089. The cubic root of 1251427049 is about 1077.6271202996.

The spelling of 1251427049 in words is "one billion, two hundred fifty-one million, four hundred twenty-seven thousand, forty-nine".