1251131863 has 2 divisors, whose sum is σ = 1251131864. Its totient is φ = 1251131862.

The previous prime is 1251131857. The next prime is 1251131879. The reversal of 1251131863 is 3681311521.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251131863 is a prime.

It is a super-2 number, since 2×1251131863² = 3130661877227701538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251131663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625565931 + 625565932.

It is an arithmetic number, because the mean of its divisors is an integer number (625565932).

Almost surely, 2^1251131863 is an apocalyptic number.

1251131863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251131863 is an equidigital number, since it uses as much as digits as its factorization.

1251131863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The square root of 1251131863 is about 35371.3423974833. The cubic root of 1251131863 is about 1077.5423835841.

The spelling of 1251131863 in words is "one billion, two hundred fifty-one million, one hundred thirty-one thousand, eight hundred sixty-three".