491583 has 4 divisors (see below), whose sum is σ = 655448. Its totient is φ = 327720.

The previous prime is 491581. The next prime is 491591. The reversal of 491583 is 385194.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 491583 - 2¹ = 491581 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 491583.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491581) 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, 81928 + ... + 81933.

It is an arithmetic number, because the mean of its divisors is an integer number (163862).

2⁴⁹¹⁵⁸³ is an apocalyptic number.

491583 is a deficient number, since it is larger than the sum of its proper divisors (163865).

491583 is a wasteful number, since it uses less digits than its factorization.

491583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163864.

The product of its digits is 4320, while the sum is 30.

The square root of 491583 is about 701.1298025330. The cubic root of 491583 is about 78.9221580088.

The spelling of 491583 in words is "four hundred ninety-one thousand, five hundred eighty-three".