251319398593 has 2 divisors, whose sum is σ = 251319398594. Its totient is φ = 251319398592.

The previous prime is 251319398581. The next prime is 251319398633. The reversal of 251319398593 is 395893913152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145991239744 + 105328158849 = 382088^2 + 324543^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251319398593 is a prime.

It is a super-2 number, since 2×251319398593² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251319398543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125659699296 + 125659699297.

It is an arithmetic number, because the mean of its divisors is an integer number (125659699297).

Almost surely, 2^251319398593 is an apocalyptic number.

It is an amenable number.

251319398593 is a deficient number, since it is larger than the sum of its proper divisors (1).

251319398593 is an equidigital number, since it uses as much as digits as its factorization.

251319398593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7873200, while the sum is 58.

The spelling of 251319398593 in words is "two hundred fifty-one billion, three hundred nineteen million, three hundred ninety-eight thousand, five hundred ninety-three".