251798081 has 2 divisors, whose sum is σ = 251798082. Its totient is φ = 251798080.

The previous prime is 251798059. The next prime is 251798093. The reversal of 251798081 is 180897152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 251698225 + 99856 = 15865^2 + 316^2 .

It is a cyclic number.

It is not a de Polignac number, because 251798081 - 2¹⁰ = 251797057 is a prime.

It is a super-2 number, since 2×251798081² = 126804547190565122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251798381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125899040 + 125899041.

It is an arithmetic number, because the mean of its divisors is an integer number (125899041).

Almost surely, 2^251798081 is an apocalyptic number.

It is an amenable number.

251798081 is a deficient number, since it is larger than the sum of its proper divisors (1).

251798081 is an equidigital number, since it uses as much as digits as its factorization.

251798081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 251798081 is about 15868.1467411919. The cubic root of 251798081 is about 631.4672119074.

The spelling of 251798081 in words is "two hundred fifty-one million, seven hundred ninety-eight thousand, eighty-one".