251340364609 has 2 divisors, whose sum is σ = 251340364610. Its totient is φ = 251340364608.

The previous prime is 251340364591. The next prime is 251340364687. The reversal of 251340364609 is 906463043152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131281579584 + 120058785025 = 362328^2 + 346495^2 .

It is a cyclic number.

It is not a de Polignac number, because 251340364609 - 2⁵ = 251340364577 is a prime.

It is not a weakly prime, because it can be changed into another prime (251340364699) 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, 125670182304 + 125670182305.

It is an arithmetic number, because the mean of its divisors is an integer number (125670182305).

Almost surely, 2^251340364609 is an apocalyptic number.

It is an amenable number.

251340364609 is a deficient number, since it is larger than the sum of its proper divisors (1).

251340364609 is an equidigital number, since it uses as much as digits as its factorization.

251340364609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 251340364609 in words is "two hundred fifty-one billion, three hundred forty million, three hundred sixty-four thousand, six hundred nine".