561087 has 12 divisors (see below), whose sum is σ = 840840. Its totient is φ = 373896.

The previous prime is 561083. The next prime is 561091. The reversal of 561087 is 780165.

It is an interprime number because it is at equal distance from previous prime (561083) and next prime (561091).

It is not a de Polignac number, because 561087 - 2² = 561083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

561087 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 561087.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 561087.

It is not an unprimeable number, because it can be changed into a prime (561083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 912 + ... + 1397.

It is an arithmetic number, because the mean of its divisors is an integer number (70070).

2⁵⁶¹⁰⁸⁷ is an apocalyptic number.

561087 is a deficient number, since it is larger than the sum of its proper divisors (279753).

561087 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 13 representation: 561087 = (168507)₁₃.

561087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2324 (or 2312 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 561087 is about 749.0574076798. The cubic root of 561087 is about 82.4790029209.

The spelling of 561087 in words is "five hundred sixty-one thousand, eighty-seven".