1251662897 has 2 divisors, whose sum is σ = 1251662898. Its totient is φ = 1251662896.

The previous prime is 1251662887. The next prime is 1251662911. The reversal of 1251662897 is 7982661521.

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., 1145077921 + 106584976 = 33839^2 + 10324^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251662897 - 2⁶ = 1251662833 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251662887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625831448 + 625831449.

It is an arithmetic number, because the mean of its divisors is an integer number (625831449).

Almost surely, 2^1251662897 is an apocalyptic number.

It is an amenable number.

1251662897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251662897 is an equidigital number, since it uses as much as digits as its factorization.

1251662897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The square root of 1251662897 is about 35378.8481581863. The cubic root of 1251662897 is about 1077.6948137478.

The spelling of 1251662897 in words is "one billion, two hundred fifty-one million, six hundred sixty-two thousand, eight hundred ninety-seven".