891057 has 4 divisors (see below), whose sum is σ = 1188080. Its totient is φ = 594036.

The previous prime is 891049. The next prime is 891061. The reversal of 891057 is 750198.

891057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 891057 - 2³ = 891049 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 891057.

It is not an unprimeable number, because it can be changed into a prime (891017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148507 + ... + 148512.

It is an arithmetic number, because the mean of its divisors is an integer number (297020).

2⁸⁹¹⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

891057 is a deficient number, since it is larger than the sum of its proper divisors (297023).

891057 is a wasteful number, since it uses less digits than its factorization.

891057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297022.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 891057 is about 943.9581558523. The cubic root of 891057 is about 96.2280818141.

The spelling of 891057 in words is "eight hundred ninety-one thousand, fifty-seven".