491613 has 4 divisors (see below), whose sum is σ = 655488. Its totient is φ = 327740.

The previous prime is 491611. The next prime is 491627. The reversal of 491613 is 316194.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 491613 - 2¹ = 491611 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491611) 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, 81933 + ... + 81938.

It is an arithmetic number, because the mean of its divisors is an integer number (163872).

2⁴⁹¹⁶¹³ is an apocalyptic number.

It is an amenable number.

491613 is a deficient number, since it is larger than the sum of its proper divisors (163875).

491613 is a wasteful number, since it uses less digits than its factorization.

491613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163874.

The product of its digits is 648, while the sum is 24.

The square root of 491613 is about 701.1511962480. The cubic root of 491613 is about 78.9237634458.

The spelling of 491613 in words is "four hundred ninety-one thousand, six hundred thirteen".