252440261 has 2 divisors, whose sum is σ = 252440262. Its totient is φ = 252440260.

The previous prime is 252440231. The next prime is 252440311. The reversal of 252440261 is 162044252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211557025 + 40883236 = 14545^2 + 6394^2 .

It is a cyclic number.

It is not a de Polignac number, because 252440261 - 2⁶ = 252440197 is a prime.

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 252440261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252440231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126220130 + 126220131.

It is an arithmetic number, because the mean of its divisors is an integer number (126220131).

Almost surely, 2^252440261 is an apocalyptic number.

It is an amenable number.

252440261 is a deficient number, since it is larger than the sum of its proper divisors (1).

252440261 is an equidigital number, since it uses as much as digits as its factorization.

252440261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 252440261 is about 15888.3687331331. The cubic root of 252440261 is about 632.0035826387.

The spelling of 252440261 in words is "two hundred fifty-two million, four hundred forty thousand, two hundred sixty-one".