873561 has 12 divisors (see below), whose sum is σ = 1261968. Its totient is φ = 537264.

The previous prime is 873553. The next prime is 873569. The reversal of 873561 is 165378.

873561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (873553) and next prime (873569).

It is not a de Polignac number, because 873561 - 2³ = 873553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (873569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 355 + ... + 1368.

It is an arithmetic number, because the mean of its divisors is an integer number (105164).

2⁸⁷³⁵⁶¹ is an apocalyptic number.

It is an amenable number.

873561 is a deficient number, since it is larger than the sum of its proper divisors (388407).

873561 is a wasteful number, since it uses less digits than its factorization.

873561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752 (or 1739 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 873561 is about 934.6448523370. The cubic root of 873561 is about 95.5940978365.

The spelling of 873561 in words is "eight hundred seventy-three thousand, five hundred sixty-one".