890561 has 16 divisors (see below), whose sum is σ = 1088640. Its totient is φ = 712320.

The previous prime is 890551. The next prime is 890563. The reversal of 890561 is 165098.

890561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-890561 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (890563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8270 + ... + 8376.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2⁸⁹⁰⁵⁶¹ is an apocalyptic number.

It is an amenable number.

890561 is a deficient number, since it is larger than the sum of its proper divisors (198079).

890561 is a wasteful number, since it uses less digits than its factorization.

890561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 890561 is about 943.6953957713. The cubic root of 890561 is about 96.2102236272.

The spelling of 890561 in words is "eight hundred ninety thousand, five hundred sixty-one".