251194863923 has 2 divisors, whose sum is σ = 251194863924. Its totient is φ = 251194863922.

The previous prime is 251194863917. The next prime is 251194863943. The reversal of 251194863923 is 329368491152.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251194863923 - 2¹⁰ = 251194862899 is a prime.

It is a super-2 number, since 2×251194863923² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251194863943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125597431961 + 125597431962.

It is an arithmetic number, because the mean of its divisors is an integer number (125597431962).

Almost surely, 2^251194863923 is an apocalyptic number.

251194863923 is a deficient number, since it is larger than the sum of its proper divisors (1).

251194863923 is an equidigital number, since it uses as much as digits as its factorization.

251194863923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 53.

The spelling of 251194863923 in words is "two hundred fifty-one billion, one hundred ninety-four million, eight hundred sixty-three thousand, nine hundred twenty-three".