251749048513 has 2 divisors, whose sum is σ = 251749048514. Its totient is φ = 251749048512.

The previous prime is 251749048511. The next prime is 251749048531. The reversal of 251749048513 is 315840947152.

It is a happy number.

Together with next prime (251749048531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 229146030864 + 22603017649 = 478692^2 + 150343^2 .

It is a cyclic number.

It is not a de Polignac number, because 251749048513 - 2¹ = 251749048511 is a prime.

It is a super-2 number, since 2×251749048513² (a number of 24 digits) contains 22 as substring.

Together with 251749048511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (251749048511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125874524256 + 125874524257.

It is an arithmetic number, because the mean of its divisors is an integer number (125874524257).

Almost surely, 2^251749048513 is an apocalyptic number.

It is an amenable number.

251749048513 is a deficient number, since it is larger than the sum of its proper divisors (1).

251749048513 is an equidigital number, since it uses as much as digits as its factorization.

251749048513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 251749048513 in words is "two hundred fifty-one billion, seven hundred forty-nine million, forty-eight thousand, five hundred thirteen".