891097 has 4 divisors (see below), whose sum is σ = 893860. Its totient is φ = 888336.

The previous prime is 891091. The next prime is 891101. The reversal of 891097 is 790198.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 337561 + 553536 = 581^2 + 744^2 .

It is a cyclic number.

It is not a de Polignac number, because 891097 - 2⁷ = 890969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891091) 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 in 3 ways as a sum of consecutive naturals, for example, 822 + ... + 1567.

It is an arithmetic number, because the mean of its divisors is an integer number (223465).

2⁸⁹¹⁰⁹⁷ is an apocalyptic number.

It is an amenable number.

891097 is a deficient number, since it is larger than the sum of its proper divisors (2763).

891097 is a wasteful number, since it uses less digits than its factorization.

891097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2762.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 891097 is about 943.9793429943. The cubic root of 891097 is about 96.2295217017.

The spelling of 891097 in words is "eight hundred ninety-one thousand, ninety-seven".