1001009091 has 16 divisors (see below), whose sum is σ = 1405814400. Its totient is φ = 631816128.

The previous prime is 1001008999. The next prime is 1001009099. The reversal of 1001009091 is 1909001001.

It is not a de Polignac number, because 1001009091 - 2¹⁸ = 1000746947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001009099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104095 + ... + 113303.

It is an arithmetic number, because the mean of its divisors is an integer number (87863400).

Almost surely, 2^1001009091 is an apocalyptic number.

1001009091 is a deficient number, since it is larger than the sum of its proper divisors (404805309).

1001009091 is a wasteful number, since it uses less digits than its factorization.

1001009091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11138.

The product of its (nonzero) digits is 81, while the sum is 21.

The square root of 1001009091 is about 31638.7277083008. The cubic root of 1001009091 is about 1000.3362505895.

The spelling of 1001009091 in words is "one billion, one million, nine thousand, ninety-one".