261590 has 32 divisors (see below), whose sum is σ = 558144. Its totient is φ = 86400.

The previous prime is 261587. The next prime is 261593. The reversal of 261590 is 95162.

It is an interprime number because it is at equal distance from previous prime (261587) and next prime (261593).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2540 + ... + 2640.

It is an arithmetic number, because the mean of its divisors is an integer number (17442).

2²⁶¹⁵⁹⁰ is an apocalyptic number.

261590 is an abundant number, since it is smaller than the sum of its proper divisors (296554).

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

261590 is a wasteful number, since it uses less digits than its factorization.

261590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 261590 is about 511.4586982348. The cubic root of 261590 is about 63.9548835675.

The spelling of 261590 in words is "two hundred sixty-one thousand, five hundred ninety".