1001091011 has 4 divisors (see below), whose sum is σ = 1001254800. Its totient is φ = 1000927224.

The previous prime is 1001090999. The next prime is 1001091017. The reversal of 1001091011 is 1101901001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1101901001 = 137 ⋅8043073.

It is a cyclic number.

It is not a de Polignac number, because 1001091011 - 2¹⁰ = 1001089987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001091017) 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, 72356 + ... + 85073.

It is an arithmetic number, because the mean of its divisors is an integer number (250313700).

Almost surely, 2^1001091011 is an apocalyptic number.

1001091011 is a deficient number, since it is larger than the sum of its proper divisors (163789).

1001091011 is an equidigital number, since it uses as much as digits as its factorization.

1001091011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163788.

The product of its (nonzero) digits is 9, while the sum is 14.

The square root of 1001091011 is about 31640.0222977165. The cubic root of 1001091011 is about 1000.3635381573.

Adding to 1001091011 its reverse (1101901001), we get a palindrome (2102992012).

The spelling of 1001091011 in words is "one billion, one million, ninety-one thousand, eleven".