2011123031 has 4 divisors (see below), whose sum is σ = 2011444200. Its totient is φ = 2010801864.

The previous prime is 2011123027. The next prime is 2011123061. The reversal of 2011123031 is 1303211102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2011123031 - 2² = 2011123027 is a prime.

It is a super-2 number, since 2×2011123031² = 8089231691637253922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2011122997 and 2011123015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011123061) 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, 151001 + ... + 163778.

It is an arithmetic number, because the mean of its divisors is an integer number (502861050).

Almost surely, 2^2011123031 is an apocalyptic number.

2011123031 is a deficient number, since it is larger than the sum of its proper divisors (321169).

2011123031 is an equidigital number, since it uses as much as digits as its factorization.

2011123031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321168.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 2011123031 is about 44845.5463898033. The cubic root of 2011123031 is about 1262.2524233809.

Adding to 2011123031 its reverse (1303211102), we get a palindrome (3314334133).

The spelling of 2011123031 in words is "two billion, eleven million, one hundred twenty-three thousand, thirty-one".