252440081 has 2 divisors, whose sum is σ = 252440082. Its totient is φ = 252440080.

The previous prime is 252440063. The next prime is 252440141. The reversal of 252440081 is 180044252.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242861056 + 9579025 = 15584^2 + 3095^2 .

It is a cyclic number.

It is not a de Polignac number, because 252440081 - 2⁶ = 252440017 is a prime.

It is a super-2 number, since 2×252440081² = 127451988990573122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 252440081.

It is not a weakly prime, because it can be changed into another prime (252440051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126220040 + 126220041.

It is an arithmetic number, because the mean of its divisors is an integer number (126220041).

Almost surely, 2^252440081 is an apocalyptic number.

It is an amenable number.

252440081 is a deficient number, since it is larger than the sum of its proper divisors (1).

252440081 is an equidigital number, since it uses as much as digits as its factorization.

252440081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 252440081 is about 15888.3630686109. The cubic root of 252440081 is about 632.0034324241.

The spelling of 252440081 in words is "two hundred fifty-two million, four hundred forty thousand, eighty-one".