891901 has 4 divisors (see below), whose sum is σ = 920704. Its totient is φ = 863100.

The previous prime is 891899. The next prime is 891907. The reversal of 891901 is 109198.

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 a cyclic number.

It is not a de Polignac number, because 891901 - 2¹ = 891899 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 891901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891907) 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, 14355 + ... + 14416.

It is an arithmetic number, because the mean of its divisors is an integer number (230176).

2⁸⁹¹⁹⁰¹ is an apocalyptic number.

It is an amenable number.

891901 is a deficient number, since it is larger than the sum of its proper divisors (28803).

891901 is a wasteful number, since it uses less digits than its factorization.

891901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28802.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 891901 is about 944.4051037558. The cubic root of 891901 is about 96.2584543088.

The spelling of 891901 in words is "eight hundred ninety-one thousand, nine hundred one".