251282081 has 2 divisors, whose sum is σ = 251282082. Its totient is φ = 251282080.

The previous prime is 251282039. The next prime is 251282099. The reversal of 251282081 is 180282152.

It is a happy number.

251282081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192238225 + 59043856 = 13865^2 + 7684^2 .

It is a cyclic number.

It is not a de Polignac number, because 251282081 - 2¹⁴ = 251265697 is a prime.

It is a super-2 number, since 2×251282081² = 126285368463381122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251282881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125641040 + 125641041.

It is an arithmetic number, because the mean of its divisors is an integer number (125641041).

Almost surely, 2^251282081 is an apocalyptic number.

It is an amenable number.

251282081 is a deficient number, since it is larger than the sum of its proper divisors (1).

251282081 is an equidigital number, since it uses as much as digits as its factorization.

251282081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 251282081 is about 15851.8794153879. The cubic root of 251282081 is about 631.0355698699.

The spelling of 251282081 in words is "two hundred fifty-one million, two hundred eighty-two thousand, eighty-one".