1091236019 has 2 divisors, whose sum is σ = 1091236020. Its totient is φ = 1091236018.

The previous prime is 1091235979. The next prime is 1091236021. The reversal of 1091236019 is 9106321901.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1091236019 - 2²⁰ = 1090187443 is a prime.

It is a super-2 number, since 2×1091236019² = 2381592098325936722, which contains 22 as substring.

Together with 1091236021, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1091232019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545618009 + 545618010.

It is an arithmetic number, because the mean of its divisors is an integer number (545618010).

Almost surely, 2^1091236019 is an apocalyptic number.

1091236019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091236019 is an equidigital number, since it uses as much as digits as its factorization.

1091236019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 1091236019 is about 33033.8617028043. The cubic root of 1091236019 is about 1029.5313225746.

The spelling of 1091236019 in words is "one billion, ninety-one million, two hundred thirty-six thousand, nineteen".