1009111091 has 2 divisors, whose sum is σ = 1009111092. Its totient is φ = 1009111090.

The previous prime is 1009111073. The next prime is 1009111121. The reversal of 1009111091 is 1901119001.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1901119001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1009111091 - 2¹⁴ = 1009094707 is a prime.

It is not a weakly prime, because it can be changed into another prime (1009111031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504555545 + 504555546.

It is an arithmetic number, because the mean of its divisors is an integer number (504555546).

Almost surely, 2^1009111091 is an apocalyptic number.

1009111091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009111091 is an equidigital number, since it uses as much as digits as its factorization.

1009111091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81, while the sum is 23.

The square root of 1009111091 is about 31766.5089520394. The cubic root of 1009111091 is about 1003.0278531854.

The spelling of 1009111091 in words is "one billion, nine million, one hundred eleven thousand, ninety-one".