261087 has 8 divisors (see below), whose sum is σ = 360240. Its totient is φ = 168000.

The previous prime is 261077. The next prime is 261089. The reversal of 261087 is 780162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261087 - 2⁴ = 261071 is a prime.

261087 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1414 + ... + 1587.

It is an arithmetic number, because the mean of its divisors is an integer number (45030).

2²⁶¹⁰⁸⁷ is an apocalyptic number.

261087 is a deficient number, since it is larger than the sum of its proper divisors (99153).

261087 is a wasteful number, since it uses less digits than its factorization.

261087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3033.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 261087 is about 510.9667308152. The cubic root of 261087 is about 63.9138652469.

The spelling of 261087 in words is "two hundred sixty-one thousand, eighty-seven".