2011403261 has 16 divisors (see below), whose sum is σ = 2323845888. Its totient is φ = 1705276800.

The previous prime is 2011403249. The next prime is 2011403311. The reversal of 2011403261 is 1623041102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011403261 is a prime.

It is a super-2 number, since 2×2011403261² = 8091486156722868242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011403221) 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, 1167881 + ... + 1169601.

It is an arithmetic number, because the mean of its divisors is an integer number (145240368).

Almost surely, 2^2011403261 is an apocalyptic number.

It is an amenable number.

2011403261 is a deficient number, since it is larger than the sum of its proper divisors (312442627).

2011403261 is a wasteful number, since it uses less digits than its factorization.

2011403261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3452.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 2011403261 is about 44848.6706714926. The cubic root of 2011403261 is about 1262.3110481001.

Adding to 2011403261 its reverse (1623041102), we get a palindrome (3634444363).

The spelling of 2011403261 in words is "two billion, eleven million, four hundred three thousand, two hundred sixty-one".