909099091 has 2 divisors, whose sum is σ = 909099092. Its totient is φ = 909099090.

The previous prime is 909099073. The next prime is 909099097. The reversal of 909099091 is 190990909.

909099091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 909099091 - 2¹⁹ = 908574803 is a prime.

It is a super-2 number, since 2×909099091² = 1652922314514052562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (909099097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454549545 + 454549546.

It is an arithmetic number, because the mean of its divisors is an integer number (454549546).

Almost surely, 2^909099091 is an apocalyptic number.

909099091 is a deficient number, since it is larger than the sum of its proper divisors (1).

909099091 is an equidigital number, since it uses as much as digits as its factorization.

909099091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 59049, while the sum is 46.

The square root of 909099091 is about 30151.2701390837. The cubic root of 909099091 is about 968.7322123630.

It can be divided in two parts, 90909 and 9091, that added together give a 5-th power (100000 = 10⁵).

The spelling of 909099091 in words is "nine hundred nine million, ninety-nine thousand, ninety-one".