1252412789 has 2 divisors, whose sum is σ = 1252412790. Its totient is φ = 1252412788.

The previous prime is 1252412761. The next prime is 1252412857. The reversal of 1252412789 is 9872142521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1140412900 + 111999889 = 33770^2 + 10583^2 .

It is a cyclic number.

It is not a de Polignac number, because 1252412789 - 2¹⁶ = 1252347253 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1252412719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626206394 + 626206395.

It is an arithmetic number, because the mean of its divisors is an integer number (626206395).

Almost surely, 2^1252412789 is an apocalyptic number.

It is an amenable number.

1252412789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252412789 is an equidigital number, since it uses as much as digits as its factorization.

1252412789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 41.

The square root of 1252412789 is about 35389.4445986370. Note that the first 3 decimals coincide. The cubic root of 1252412789 is about 1077.9099923932.

The spelling of 1252412789 in words is "one billion, two hundred fifty-two million, four hundred twelve thousand, seven hundred eighty-nine".