2011610261 has 8 divisors (see below), whose sum is σ = 2021588184. Its totient is φ = 2001657600.

The previous prime is 2011610239. The next prime is 2011610267. The reversal of 2011610261 is 1620161102.

It can be written as a sum of positive squares in 4 ways, for example, as 707028100 + 1304582161 = 26590^2 + 36119^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2011610261 - 2⁶ = 2011610197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011610267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164561 + ... + 176361.

It is an arithmetic number, because the mean of its divisors is an integer number (252698523).

Almost surely, 2^2011610261 is an apocalyptic number.

It is an amenable number.

2011610261 is a deficient number, since it is larger than the sum of its proper divisors (9977923).

2011610261 is a wasteful number, since it uses less digits than its factorization.

2011610261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12631.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 2011610261 is about 44850.9783728293. The cubic root of 2011610261 is about 1262.3543494491.

Adding to 2011610261 its reverse (1620161102), we get a palindrome (3631771363).

The spelling of 2011610261 in words is "two billion, eleven million, six hundred ten thousand, two hundred sixty-one".