261587 has 2 divisors, whose sum is σ = 261588. Its totient is φ = 261586.

The previous prime is 261581. The next prime is 261593. The reversal of 261587 is 785162.

It is a balanced prime because it is at equal distance from previous prime (261581) and next prime (261593).

It is a cyclic number.

It is not a de Polignac number, because 261587 - 2⁶ = 261523 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261587.

It is not a weakly prime, because it can be changed into another prime (261581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130793 + 130794.

It is an arithmetic number, because the mean of its divisors is an integer number (130794).

2²⁶¹⁵⁸⁷ is an apocalyptic number.

261587 is a deficient number, since it is larger than the sum of its proper divisors (1).

261587 is an equidigital number, since it uses as much as digits as its factorization.

261587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 29.

The square root of 261587 is about 511.4557654382. The cubic root of 261587 is about 63.9546390814.

It can be divided in two parts, 261 and 587, that added together give a palindrome (848).

The spelling of 261587 in words is "two hundred sixty-one thousand, five hundred eighty-seven".