9091000001 has 4 divisors (see below), whose sum is σ = 9181010004. Its totient is φ = 9000990000.

The previous prime is 9090999961. The next prime is 9091000013. The reversal of 9091000001 is 1000001909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1000001909 = 101 ⋅9901009.

It can be written as a sum of positive squares in 2 ways, for example, as 5026810000 + 4064190001 = 70900^2 + 63751^2 .

It is a cyclic number.

It is not a de Polignac number, because 9091000001 - 2¹⁰ = 9090998977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9091000021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45004850 + ... + 45005051.

It is an arithmetic number, because the mean of its divisors is an integer number (2295252501).

Almost surely, 2^9091000001 is an apocalyptic number.

It is an amenable number.

9091000001 is a deficient number, since it is larger than the sum of its proper divisors (90010003).

9091000001 is a wasteful number, since it uses less digits than its factorization.

9091000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90010002.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 9091000001 is about 95346.7356599061. The cubic root of 9091000001 is about 2087.0709793566.

It can be divided in two parts, 909 and 1000001, that multiplied together give a palindrome (909000909).

The spelling of 9091000001 in words is "nine billion, ninety-one million, one", and thus it is an aban number and an uban number.