2011123231 has 16 divisors (see below), whose sum is σ = 2184634368. Its totient is φ = 1840370400.

The previous prime is 2011123217. The next prime is 2011123237. The reversal of 2011123231 is 1323211102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011123231 is a prime.

It is a super-2 number, since 2×2011123231² = 8089233300535758722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011123237) 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, 820650 + ... + 823096.

It is an arithmetic number, because the mean of its divisors is an integer number (136539648).

Almost surely, 2^2011123231 is an apocalyptic number.

2011123231 is a deficient number, since it is larger than the sum of its proper divisors (173511137).

2011123231 is a wasteful number, since it uses less digits than its factorization.

2011123231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2982.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2011123231 is about 44845.5486196791. The cubic root of 2011123231 is about 1262.2524652233.

Adding to 2011123231 its reverse (1323211102), we get a palindrome (3334334333).

The spelling of 2011123231 in words is "two billion, eleven million, one hundred twenty-three thousand, two hundred thirty-one".