261682 has 4 divisors (see below), whose sum is σ = 392526. Its totient is φ = 130840.

The previous prime is 261673. The next prime is 261697. The reversal of 261682 is 286162.

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

It can be written as a sum of positive squares in only one way, i.e., 259081 + 2601 = 509^2 + 51^2 .

It is an Ulam number.

It is an unprimeable number.

261682 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65419 + ... + 65422.

2²⁶¹⁶⁸² is an apocalyptic number.

261682 is a deficient number, since it is larger than the sum of its proper divisors (130844).

261682 is a wasteful number, since it uses less digits than its factorization.

261682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130843.

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

The square root of 261682 is about 511.5486291644. The cubic root of 261682 is about 63.9623802349.

The spelling of 261682 in words is "two hundred sixty-one thousand, six hundred eighty-two".