891369 has 6 divisors (see below), whose sum is σ = 1287546. Its totient is φ = 594240.

The previous prime is 891349. The next prime is 891377. The reversal of 891369 is 963198.

It can be written as a sum of positive squares in only one way, i.e., 660969 + 230400 = 813^2 + 480^2 .

It is not a de Polignac number, because 891369 - 2¹⁷ = 760297 is a prime.

It is a super-2 number, since 2×891369² = 1589077388322, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (891329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49512 + ... + 49529.

It is an arithmetic number, because the mean of its divisors is an integer number (214591).

2⁸⁹¹³⁶⁹ is an apocalyptic number.

It is an amenable number.

891369 is a deficient number, since it is larger than the sum of its proper divisors (396177).

891369 is a wasteful number, since it uses less digits than its factorization.

891369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99047 (or 99044 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 891369 is about 944.1234029511. The cubic root of 891369 is about 96.2393117945.

The spelling of 891369 in words is "eight hundred ninety-one thousand, three hundred sixty-nine".