1011001001 has 16 divisors (see below), whose sum is σ = 1094419200. Its totient is φ = 930787200.

The previous prime is 1011000983. The next prime is 1011001003. The reversal of 1011001001 is 1001001101.

It is not a de Polignac number, because 1011001001 - 2⁶ = 1011000937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011001003) 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, 208715 + ... + 213503.

It is an arithmetic number, because the mean of its divisors is an integer number (68401200).

Almost surely, 2^1011001001 is an apocalyptic number.

It is an amenable number.

1011001001 is a deficient number, since it is larger than the sum of its proper divisors (83418199).

1011001001 is a wasteful number, since it uses less digits than its factorization.

1011001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5120.

The product of its (nonzero) digits is 1, while the sum is 5.

The square root of 1011001001 is about 31796.2419320271. The cubic root of 1011001001 is about 1003.6536350269.

Adding to 1011001001 its reverse (1001001101), we get a palindrome (2012002102).

It can be divided in two parts, 101 and 1001001, that multiplied together give a palindrome (101101101).

The spelling of 1011001001 in words is "one billion, eleven million, one thousand, one".