1123272391 has 2 divisors, whose sum is σ = 1123272392. Its totient is φ = 1123272390.

The previous prime is 1123272377. The next prime is 1123272401. The reversal of 1123272391 is 1932723211.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123272391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123272791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561636195 + 561636196.

It is an arithmetic number, because the mean of its divisors is an integer number (561636196).

Almost surely, 2^1123272391 is an apocalyptic number.

1123272391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123272391 is an equidigital number, since it uses as much as digits as its factorization.

1123272391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 1123272391 is about 33515.2560933077. The cubic root of 1123272391 is about 1039.5092578079.

The spelling of 1123272391 in words is "one billion, one hundred twenty-three million, two hundred seventy-two thousand, three hundred ninety-one".