252478609 has 2 divisors, whose sum is σ = 252478610. Its totient is φ = 252478608.

The previous prime is 252478607. The next prime is 252478637. The reversal of 252478609 is 906874252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238393600 + 14085009 = 15440^2 + 3753^2 .

It is a cyclic number.

It is not a de Polignac number, because 252478609 - 2¹ = 252478607 is a prime.

Together with 252478607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (252478607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126239304 + 126239305.

It is an arithmetic number, because the mean of its divisors is an integer number (126239305).

Almost surely, 2^252478609 is an apocalyptic number.

It is an amenable number.

252478609 is a deficient number, since it is larger than the sum of its proper divisors (1).

252478609 is an equidigital number, since it uses as much as digits as its factorization.

252478609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 252478609 is about 15889.5754820574. The cubic root of 252478609 is about 632.0355834062.

It can be divided in two parts, 25247 and 8609, that added together give a square (33856 = 184²).

The spelling of 252478609 in words is "two hundred fifty-two million, four hundred seventy-eight thousand, six hundred nine".