252729989 has 2 divisors, whose sum is σ = 252729990. Its totient is φ = 252729988.

The previous prime is 252729979. The next prime is 252730019. The reversal of 252729989 is 989927252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135722500 + 117007489 = 11650^2 + 10817^2 .

It is a cyclic number.

It is not a de Polignac number, because 252729989 - 2⁸ = 252729733 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 252729989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252729929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126364994 + 126364995.

It is an arithmetic number, because the mean of its divisors is an integer number (126364995).

Almost surely, 2^252729989 is an apocalyptic number.

It is an amenable number.

252729989 is a deficient number, since it is larger than the sum of its proper divisors (1).

252729989 is an equidigital number, since it uses as much as digits as its factorization.

252729989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 53.

The square root of 252729989 is about 15897.4837317105. The cubic root of 252729989 is about 632.2452756316.

The spelling of 252729989 in words is "two hundred fifty-two million, seven hundred twenty-nine thousand, nine hundred eighty-nine".