261286 has 4 divisors (see below), whose sum is σ = 391932. Its totient is φ = 130642.

The previous prime is 261281. The next prime is 261301. The reversal of 261286 is 682162.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 261286.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65320 + ... + 65323.

It is an arithmetic number, because the mean of its divisors is an integer number (97983).

2²⁶¹²⁸⁶ is an apocalyptic number.

261286 is a deficient number, since it is larger than the sum of its proper divisors (130646).

261286 is a wasteful number, since it uses less digits than its factorization.

261286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130645.

The product of its digits is 1152, while the sum is 25.

The square root of 261286 is about 511.1614226445. The cubic root of 261286 is about 63.9300994640.

The spelling of 261286 in words is "two hundred sixty-one thousand, two hundred eighty-six".