891607 has 4 divisors (see below), whose sum is σ = 894016. Its totient is φ = 889200.

The previous prime is 891601. The next prime is 891617. The reversal of 891607 is 706198.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 706198 = 2 ⋅353099.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-891607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891601) 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 3 ways as a sum of consecutive naturals, for example, 519 + ... + 1432.

It is an arithmetic number, because the mean of its divisors is an integer number (223504).

2⁸⁹¹⁶⁰⁷ is an apocalyptic number.

891607 is a deficient number, since it is larger than the sum of its proper divisors (2409).

891607 is a wasteful number, since it uses less digits than its factorization.

891607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2408.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 891607 is about 944.2494373840. The cubic root of 891607 is about 96.2478764922.

The spelling of 891607 in words is "eight hundred ninety-one thousand, six hundred seven".