261060805 has 8 divisors (see below), whose sum is σ = 314758944. Its totient is φ = 207858000.

The previous prime is 261060803. The next prime is 261060809. The reversal of 261060805 is 508060162.

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

It is not a de Polignac number, because 261060805 - 2¹ = 261060803 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 (261060803) 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, 122671 + ... + 124780.

It is an arithmetic number, because the mean of its divisors is an integer number (39344868).

Almost surely, 2^261060805 is an apocalyptic number.

It is an amenable number.

261060805 is a deficient number, since it is larger than the sum of its proper divisors (53698139).

261060805 is a wasteful number, since it uses less digits than its factorization.

261060805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247667.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 261060805 is about 16157.3761793182. The cubic root of 261060805 is about 639.1172767115.

The spelling of 261060805 in words is "two hundred sixty-one million, sixty thousand, eight hundred five".