1313188889 has 2 divisors, whose sum is σ = 1313188890. Its totient is φ = 1313188888.

The previous prime is 1313188873. The next prime is 1313188913. The reversal of 1313188889 is 9888813131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 813219289 + 499969600 = 28517^2 + 22360^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313188889 - 2⁴ = 1313188873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1313182889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656594444 + 656594445.

It is an arithmetic number, because the mean of its divisors is an integer number (656594445).

Almost surely, 2^1313188889 is an apocalyptic number.

It is an amenable number.

1313188889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313188889 is an equidigital number, since it uses as much as digits as its factorization.

1313188889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 50.

The square root of 1313188889 is about 36237.9481897085. The cubic root of 1313188889 is about 1095.0713071861.

The spelling of 1313188889 in words is "one billion, three hundred thirteen million, one hundred eighty-eight thousand, eight hundred eighty-nine".