873991 has 2 divisors, whose sum is σ = 873992. Its totient is φ = 873990.

The previous prime is 873989. The next prime is 874001. The reversal of 873991 is 199378.

873991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 873991 - 2¹ = 873989 is a prime.

Together with 873989, it forms a pair of twin primes.

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 873991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (873091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436995 + 436996.

It is an arithmetic number, because the mean of its divisors is an integer number (436996).

2⁸⁷³⁹⁹¹ is an apocalyptic number.

873991 is a deficient number, since it is larger than the sum of its proper divisors (1).

873991 is an equidigital number, since it uses as much as digits as its factorization.

873991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 37.

The square root of 873991 is about 934.8748579355. The cubic root of 873991 is about 95.6097802824.

The spelling of 873991 in words is "eight hundred seventy-three thousand, nine hundred ninety-one".