491556 has 48 divisors (see below), whose sum is σ = 1298304. Its totient is φ = 143616.

The previous prime is 491539. The next prime is 491581. The reversal of 491556 is 655194.

It is a super-2 number, since 2×491556² = 483254602272, which contains 22 as substring.

Its product of digits (5400) is a multiple of the sum of its prime factors (180).

It is an unprimeable number.

491556 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3520 + ... + 3656.

It is an arithmetic number, because the mean of its divisors is an integer number (27048).

2⁴⁹¹⁵⁵⁶ is an apocalyptic number.

491556 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (649152).

491556 is an abundant number, since it is smaller than the sum of its proper divisors (806748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491556 is a wasteful number, since it uses less digits than its factorization.

491556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180 (or 178 counting only the distinct ones).

The product of its digits is 5400, while the sum is 30.

The square root of 491556 is about 701.1105476314. The cubic root of 491556 is about 78.9207130597.

The spelling of 491556 in words is "four hundred ninety-one thousand, five hundred fifty-six".