1199999189 has 2 divisors, whose sum is σ = 1199999190. Its totient is φ = 1199999188.

The previous prime is 1199999161. The next prime is 1199999197. The reversal of 1199999189 is 9819999911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1198198225 + 1800964 = 34615^2 + 1342^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1199999189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1199969189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 599999594 + 599999595.

It is an arithmetic number, because the mean of its divisors is an integer number (599999595).

Almost surely, 2^1199999189 is an apocalyptic number.

It is an amenable number.

1199999189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1199999189 is an equidigital number, since it uses as much as digits as its factorization.

1199999189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4251528, while the sum is 65.

The square root of 1199999189 is about 34641.0044455989. The cubic root of 1199999189 is about 1062.6583297892.

The spelling of 1199999189 in words is "one billion, one hundred ninety-nine million, nine hundred ninety-nine thousand, one hundred eighty-nine".