261560806 has 16 divisors (see below), whose sum is σ = 429685200. Its totient is φ = 118673568.

The previous prime is 261560731. The next prime is 261560809. The reversal of 261560806 is 608065162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261560809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83721 + ... + 86788.

It is an arithmetic number, because the mean of its divisors is an integer number (26855325).

Almost surely, 2^261560806 is an apocalyptic number.

261560806 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

261560806 is a deficient number, since it is larger than the sum of its proper divisors (168124394).

261560806 is a wasteful number, since it uses less digits than its factorization.

261560806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170583.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 261560806 is about 16172.8416179718. The cubic root of 261560806 is about 639.5250431199.

The spelling of 261560806 in words is "two hundred sixty-one million, five hundred sixty thousand, eight hundred six".