1251160399 has 2 divisors, whose sum is σ = 1251160400. Its totient is φ = 1251160398.

The previous prime is 1251160381. The next prime is 1251160409. The reversal of 1251160399 is 9930611521.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1251160399 - 2⁹ = 1251159887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251160499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625580199 + 625580200.

It is an arithmetic number, because the mean of its divisors is an integer number (625580200).

Almost surely, 2^1251160399 is an apocalyptic number.

1251160399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251160399 is an equidigital number, since it uses as much as digits as its factorization.

1251160399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 1251160399 is about 35371.7457725796. The cubic root of 1251160399 is about 1077.5505757704.

The spelling of 1251160399 in words is "one billion, two hundred fifty-one million, one hundred sixty thousand, three hundred ninety-nine".