1109071391 has 2 divisors, whose sum is σ = 1109071392. Its totient is φ = 1109071390.

The previous prime is 1109071319. The next prime is 1109071399. The reversal of 1109071391 is 1931709011.

Together with previous prime (1109071319) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (1931709011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1109071391 - 2²² = 1104877087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109071399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554535695 + 554535696.

It is an arithmetic number, because the mean of its divisors is an integer number (554535696).

Almost surely, 2^1109071391 is an apocalyptic number.

1109071391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109071391 is an equidigital number, since it uses as much as digits as its factorization.

1109071391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1701, while the sum is 32.

The square root of 1109071391 is about 33302.7234772173. The cubic root of 1109071391 is about 1035.1099919667.

The spelling of 1109071391 in words is "one billion, one hundred nine million, seventy-one thousand, three hundred ninety-one".