1251275863 has 2 divisors, whose sum is σ = 1251275864. Its totient is φ = 1251275862.

The previous prime is 1251275797. The next prime is 1251275867. The reversal of 1251275863 is 3685721521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251275863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251275867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625637931 + 625637932.

It is an arithmetic number, because the mean of its divisors is an integer number (625637932).

Almost surely, 2^1251275863 is an apocalyptic number.

1251275863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251275863 is an equidigital number, since it uses as much as digits as its factorization.

1251275863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 40.

The square root of 1251275863 is about 35373.3778850706. The cubic root of 1251275863 is about 1077.5837221926.

The spelling of 1251275863 in words is "one billion, two hundred fifty-one million, two hundred seventy-five thousand, eight hundred sixty-three".