491656 has 32 divisors (see below), whose sum is σ = 1039680. Its totient is φ = 216000.

The previous prime is 491653. The next prime is 491669. The reversal of 491656 is 656194.

491656 = T₃₃ + T₃₄ + ... + T₁₄₃.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (491651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3181 + ... + 3331.

It is an arithmetic number, because the mean of its divisors is an integer number (32490).

2⁴⁹¹⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (519840).

491656 is an abundant number, since it is smaller than the sum of its proper divisors (548024).

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

491656 is a wasteful number, since it uses less digits than its factorization.

491656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 201 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 491656 is about 701.1818594345. The cubic root of 491656 is about 78.9260644583.

The spelling of 491656 in words is "four hundred ninety-one thousand, six hundred fifty-six".