887581 has 2 divisors, whose sum is σ = 887582. Its totient is φ = 887580.

The previous prime is 887573. The next prime is 887599. The reversal of 887581 is 185788.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 792100 + 95481 = 890^2 + 309^2 .

It is a cyclic number.

It is not a de Polignac number, because 887581 - 2³ = 887573 is a prime.

It is a super-2 number, since 2×887581² = 1575600063122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 887581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (887681) by changing a digit.

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, 443790 + 443791.

It is an arithmetic number, because the mean of its divisors is an integer number (443791).

2⁸⁸⁷⁵⁸¹ is an apocalyptic number.

It is an amenable number.

887581 is a deficient number, since it is larger than the sum of its proper divisors (1).

887581 is an equidigital number, since it uses as much as digits as its factorization.

887581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17920, while the sum is 37.

The square root of 887581 is about 942.1151734263. The cubic root of 887581 is about 96.1027906514.

The spelling of 887581 in words is "eight hundred eighty-seven thousand, five hundred eighty-one".