1199644889 has 2 divisors, whose sum is σ = 1199644890. Its totient is φ = 1199644888.

The previous prime is 1199644867. The next prime is 1199644907. The reversal of 1199644889 is 9884469911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1161105625 + 38539264 = 34075^2 + 6208^2 .

It is a cyclic number.

It is not a de Polignac number, because 1199644889 - 2²⁰ = 1198596313 is a prime.

It is not a weakly prime, because it can be changed into another prime (1199644489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 599822444 + 599822445.

It is an arithmetic number, because the mean of its divisors is an integer number (599822445).

Almost surely, 2^1199644889 is an apocalyptic number.

It is an amenable number.

1199644889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1199644889 is an equidigital number, since it uses as much as digits as its factorization.

1199644889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 59.

The square root of 1199644889 is about 34635.8901863371. The cubic root of 1199644889 is about 1062.5537361335.

The spelling of 1199644889 in words is "one billion, one hundred ninety-nine million, six hundred forty-four thousand, eight hundred eighty-nine".