261173286 has 24 divisors (see below), whose sum is σ = 617319144. Its totient is φ = 79143360.

The previous prime is 261173273. The next prime is 261173293. The reversal of 261173286 is 682371162.

261173286 is a `hidden beast` number, since 2 + 611 + 7 + 32 + 8 + 6 = 666.

It is a super-2 number, since 2×261173286² = 136422970640075592, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 261173286.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 659331 + ... + 659726.

It is an arithmetic number, because the mean of its divisors is an integer number (25721631).

Almost surely, 2^261173286 is an apocalyptic number.

261173286 is an abundant number, since it is smaller than the sum of its proper divisors (356145858).

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

261173286 is a wasteful number, since it uses less digits than its factorization.

261173286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319076 (or 1319073 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 261173286 is about 16160.8565985841. The cubic root of 261173286 is about 639.2090538337.

It can be divided in two parts, 26117 and 3286, that added together give a triangular number (29403 = T₂₄₂).

The spelling of 261173286 in words is "two hundred sixty-one million, one hundred seventy-three thousand, two hundred eighty-six".