261085506 has 32 divisors (see below), whose sum is σ = 570943296. Its totient is φ = 78936000.

The previous prime is 261085477. The next prime is 261085511. The reversal of 261085506 is 605580162.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 26136 + ... + 34716.

It is an arithmetic number, because the mean of its divisors is an integer number (17841978).

Almost surely, 2^261085506 is an apocalyptic number.

261085506 is an abundant number, since it is smaller than the sum of its proper divisors (309857790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261085506 is a wasteful number, since it uses less digits than its factorization.

261085506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9058.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 261085506 is about 16158.1405489617. The cubic root of 261085506 is about 639.1374333668.

The spelling of 261085506 in words is "two hundred sixty-one million, eighty-five thousand, five hundred six".