1131212189 has 2 divisors, whose sum is σ = 1131212190. Its totient is φ = 1131212188.

The previous prime is 1131212153. The next prime is 1131212191. The reversal of 1131212189 is 9812121311.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 721352164 + 409860025 = 26858^2 + 20245^2 .

It is an emirp because it is prime and its reverse (9812121311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1131212189 - 2²⁴ = 1114434973 is a prime.

Together with 1131212191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131218189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565606094 + 565606095.

It is an arithmetic number, because the mean of its divisors is an integer number (565606095).

Almost surely, 2^1131212189 is an apocalyptic number.

It is an amenable number.

1131212189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131212189 is an equidigital number, since it uses as much as digits as its factorization.

1131212189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 29.

The square root of 1131212189 is about 33633.4980190881. The cubic root of 1131212189 is about 1041.9527503279.

The spelling of 1131212189 in words is "one billion, one hundred thirty-one million, two hundred twelve thousand, one hundred eighty-nine".