1009191091 has 8 divisors (see below), whose sum is σ = 1019831904. Its totient is φ = 998563200.

The previous prime is 1009191083. The next prime is 1009191163. The reversal of 1009191091 is 1901919001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1009191091 - 2³ = 1009191083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1009191011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284370 + ... + 287896.

It is an arithmetic number, because the mean of its divisors is an integer number (127478988).

Almost surely, 2^1009191091 is an apocalyptic number.

1009191091 is a deficient number, since it is larger than the sum of its proper divisors (10640813).

1009191091 is a wasteful number, since it uses less digits than its factorization.

1009191091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6461.

The product of its (nonzero) digits is 729, while the sum is 31.

The square root of 1009191091 is about 31767.7681148676. The cubic root of 1009191091 is about 1003.0543583966.

The spelling of 1009191091 in words is "one billion, nine million, one hundred ninety-one thousand, ninety-one".