1252523989 has 2 divisors, whose sum is σ = 1252523990. Its totient is φ = 1252523988.

The previous prime is 1252523971. The next prime is 1252524001. The reversal of 1252523989 is 9893252521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 828864100 + 423659889 = 28790^2 + 20583^2 .

It is an emirp because it is prime and its reverse (9893252521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1252523989 - 2⁹ = 1252523477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1252523939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626261994 + 626261995.

It is an arithmetic number, because the mean of its divisors is an integer number (626261995).

Almost surely, 2^1252523989 is an apocalyptic number.

It is an amenable number.

1252523989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252523989 is an equidigital number, since it uses as much as digits as its factorization.

1252523989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 46.

The square root of 1252523989 is about 35391.0156536938. The cubic root of 1252523989 is about 1077.9418934951.

The spelling of 1252523989 in words is "one billion, two hundred fifty-two million, five hundred twenty-three thousand, nine hundred eighty-nine".