250805081 has 2 divisors, whose sum is σ = 250805082. Its totient is φ = 250805080.

The previous prime is 250805069. The next prime is 250805083. The reversal of 250805081 is 180508052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187443481 + 63361600 = 13691^2 + 7960^2 .

It is a cyclic number.

It is not a de Polignac number, because 250805081 - 2²⁶ = 183696217 is a prime.

It is a super-2 number, since 2×250805081² = 125806377310833122, which contains 22 as substring.

Together with 250805083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (250805083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125402540 + 125402541.

It is an arithmetic number, because the mean of its divisors is an integer number (125402541).

Almost surely, 2^250805081 is an apocalyptic number.

It is an amenable number.

250805081 is a deficient number, since it is larger than the sum of its proper divisors (1).

250805081 is an equidigital number, since it uses as much as digits as its factorization.

250805081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 250805081 is about 15836.8267339136. The cubic root of 250805081 is about 630.6360260206.

The spelling of 250805081 in words is "two hundred fifty million, eight hundred five thousand, eighty-one".