891611 has 4 divisors (see below), whose sum is σ = 1018992. Its totient is φ = 764232.

The previous prime is 891601. The next prime is 891617. The reversal of 891611 is 116198.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 116198 = 2 ⋅58099.

It is not a de Polignac number, because 891611 - 2¹⁸ = 629467 is a prime.

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 891611.

It is not an unprimeable number, because it can be changed into a prime (891617) 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, 63680 + ... + 63693.

It is an arithmetic number, because the mean of its divisors is an integer number (254748).

2⁸⁹¹⁶¹¹ is an apocalyptic number.

891611 is a deficient number, since it is larger than the sum of its proper divisors (127381).

891611 is a wasteful number, since it uses less digits than its factorization.

891611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127380.

The product of its digits is 432, while the sum is 26.

The square root of 891611 is about 944.2515554660. The cubic root of 891611 is about 96.2480204237.

It can be divided in two parts, 8 and 91611, that added together give a palindrome (91619).

The spelling of 891611 in words is "eight hundred ninety-one thousand, six hundred eleven".