1123161191 has 2 divisors, whose sum is σ = 1123161192. Its totient is φ = 1123161190.

The previous prime is 1123161187. The next prime is 1123161239. The reversal of 1123161191 is 1911613211.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1123161191 - 2² = 1123161187 is a prime.

It is a super-2 number, since 2×1123161191² = 2522982121937076962, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1123161191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123161101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561580595 + 561580596.

It is an arithmetic number, because the mean of its divisors is an integer number (561580596).

Almost surely, 2^1123161191 is an apocalyptic number.

1123161191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123161191 is an equidigital number, since it uses as much as digits as its factorization.

1123161191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 26.

The square root of 1123161191 is about 33513.5971062493. The cubic root of 1123161191 is about 1039.4749540940.

The spelling of 1123161191 in words is "one billion, one hundred twenty-three million, one hundred sixty-one thousand, one hundred ninety-one".