261105011 has 4 divisors (see below), whose sum is σ = 274847400. Its totient is φ = 247362624.

The previous prime is 261105007. The next prime is 261105017. The reversal of 261105011 is 110501162.

261105011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110501162 = 2 ⋅55250581.

It is a cyclic number.

It is not a de Polignac number, because 261105011 - 2² = 261105007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261105017) 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, 6871166 + ... + 6871203.

It is an arithmetic number, because the mean of its divisors is an integer number (68711850).

Almost surely, 2^261105011 is an apocalyptic number.

261105011 is a deficient number, since it is larger than the sum of its proper divisors (13742389).

261105011 is a wasteful number, since it uses less digits than its factorization.

261105011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13742388.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 261105011 is about 16158.7441034259. The cubic root of 261105011 is about 639.1533490533.

Adding to 261105011 its reverse (110501162), we get a palindrome (371606173).

The spelling of 261105011 in words is "two hundred sixty-one million, one hundred five thousand, eleven".