251144515591 has 2 divisors, whose sum is σ = 251144515592. Its totient is φ = 251144515590.

The previous prime is 251144515483. The next prime is 251144515613. The reversal of 251144515591 is 195515441152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251144515591 - 2³³ = 242554580999 is a prime.

It is a super-2 number, since 2×251144515591² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251144513591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125572257795 + 125572257796.

It is an arithmetic number, because the mean of its divisors is an integer number (125572257796).

Almost surely, 2^251144515591 is an apocalyptic number.

251144515591 is a deficient number, since it is larger than the sum of its proper divisors (1).

251144515591 is an equidigital number, since it uses as much as digits as its factorization.

251144515591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180000, while the sum is 43.

The spelling of 251144515591 in words is "two hundred fifty-one billion, one hundred forty-four million, five hundred fifteen thousand, five hundred ninety-one".