251044081 has 2 divisors, whose sum is σ = 251044082. Its totient is φ = 251044080.

The previous prime is 251044037. The next prime is 251044091. The reversal of 251044081 is 180440152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157728481 + 93315600 = 12559^2 + 9660^2 .

It is a cyclic number.

It is not a de Polignac number, because 251044081 - 2⁷ = 251043953 is a prime.

It is a super-2 number, since 2×251044081² = 126046261210269122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251044021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125522040 + 125522041.

It is an arithmetic number, because the mean of its divisors is an integer number (125522041).

Almost surely, 2^251044081 is an apocalyptic number.

It is an amenable number.

251044081 is a deficient number, since it is larger than the sum of its proper divisors (1).

251044081 is an equidigital number, since it uses as much as digits as its factorization.

251044081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 251044081 is about 15844.3706407039. The cubic root of 251044081 is about 630.8362800174.

The spelling of 251044081 in words is "two hundred fifty-one million, forty-four thousand, eighty-one".