261158 has 4 divisors (see below), whose sum is σ = 391740. Its totient is φ = 130578.

The previous prime is 261127. The next prime is 261167. The reversal of 261158 is 851162.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

261158 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65288 + ... + 65291.

It is an arithmetic number, because the mean of its divisors is an integer number (97935).

2²⁶¹¹⁵⁸ is an apocalyptic number.

261158 is a deficient number, since it is larger than the sum of its proper divisors (130582).

261158 is a wasteful number, since it uses less digits than its factorization.

261158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130581.

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

The square root of 261158 is about 511.0362022401. The cubic root of 261158 is about 63.9196583007.

The spelling of 261158 in words is "two hundred sixty-one thousand, one hundred fifty-eight".