1139568509 has 2 divisors, whose sum is σ = 1139568510. Its totient is φ = 1139568508.

The previous prime is 1139568487. The next prime is 1139568517. The reversal of 1139568509 is 9058659311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 849547609 + 290020900 = 29147^2 + 17030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1139568509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1139568559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569784254 + 569784255.

It is an arithmetic number, because the mean of its divisors is an integer number (569784255).

Almost surely, 2^1139568509 is an apocalyptic number.

It is an amenable number.

1139568509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1139568509 is an equidigital number, since it uses as much as digits as its factorization.

1139568509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 291600, while the sum is 47.

The square root of 1139568509 is about 33757.4955972744. The cubic root of 1139568509 is about 1044.5121106425.

The spelling of 1139568509 in words is "one billion, one hundred thirty-nine million, five hundred sixty-eight thousand, five hundred nine".