1189100813 has 2 divisors, whose sum is σ = 1189100814. Its totient is φ = 1189100812.

The previous prime is 1189100779. The next prime is 1189100831. The reversal of 1189100813 is 3180019811.

Together with next prime (1189100831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1187629444 + 1471369 = 34462^2 + 1213^2 .

It is an emirp because it is prime and its reverse (3180019811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1189100813 - 2⁸ = 1189100557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1189100813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1189106813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594550406 + 594550407.

It is an arithmetic number, because the mean of its divisors is an integer number (594550407).

Almost surely, 2^1189100813 is an apocalyptic number.

It is an amenable number.

1189100813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1189100813 is an equidigital number, since it uses as much as digits as its factorization.

1189100813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 32.

The square root of 1189100813 is about 34483.3410939253. The cubic root of 1189100813 is about 1059.4315253126.

The spelling of 1189100813 in words is "one billion, one hundred eighty-nine million, one hundred thousand, eight hundred thirteen".