261100085 has 16 divisors (see below), whose sum is σ = 321273216. Its totient is φ = 203598528.

The previous prime is 261100039. The next prime is 261100097. The reversal of 261100085 is 580001162.

It is a cyclic number.

It is not a de Polignac number, because 261100085 - 2⁸ = 261099829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261100085.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138167 + ... + 140043.

It is an arithmetic number, because the mean of its divisors is an integer number (20079576).

Almost surely, 2^261100085 is an apocalyptic number.

It is an amenable number.

261100085 is a deficient number, since it is larger than the sum of its proper divisors (60173131).

261100085 is a wasteful number, since it uses less digits than its factorization.

261100085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 261100085 is about 16158.5916774947. The cubic root of 261100085 is about 639.1493296115.

The spelling of 261100085 in words is "two hundred sixty-one million, one hundred thousand, eighty-five".