1253319989 has 2 divisors, whose sum is σ = 1253319990. Its totient is φ = 1253319988.

The previous prime is 1253319967. The next prime is 1253320007. The reversal of 1253319989 is 9899133521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1053521764 + 199798225 = 32458^2 + 14135^2 .

It is a cyclic number.

It is not a de Polignac number, because 1253319989 - 2⁸ = 1253319733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1253315989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626659994 + 626659995.

It is an arithmetic number, because the mean of its divisors is an integer number (626659995).

Almost surely, 2^1253319989 is an apocalyptic number.

It is an amenable number.

1253319989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253319989 is an equidigital number, since it uses as much as digits as its factorization.

1253319989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 50.

The square root of 1253319989 is about 35402.2596595189. The cubic root of 1253319989 is about 1078.1701951889.

The spelling of 1253319989 in words is "one billion, two hundred fifty-three million, three hundred nineteen thousand, nine hundred eighty-nine".