1121231191 has 2 divisors, whose sum is σ = 1121231192. Its totient is φ = 1121231190.

The previous prime is 1121231159. The next prime is 1121231203. The reversal of 1121231191 is 1911321211.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1121231191 - 2⁵ = 1121231159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121231101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560615595 + 560615596.

It is an arithmetic number, because the mean of its divisors is an integer number (560615596).

Almost surely, 2^1121231191 is an apocalyptic number.

1121231191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121231191 is an equidigital number, since it uses as much as digits as its factorization.

1121231191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 22.

The square root of 1121231191 is about 33484.7904428264. The cubic root of 1121231191 is about 1038.8792138757.

The spelling of 1121231191 in words is "one billion, one hundred twenty-one million, two hundred thirty-one thousand, one hundred ninety-one".