491723 has 4 divisors (see below), whose sum is σ = 493608. Its totient is φ = 489840.

The previous prime is 491719. The next prime is 491731. The reversal of 491723 is 327194.

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

It is a cyclic number.

It is not a de Polignac number, because 491723 - 2² = 491719 is a prime.

It is a super-3 number, since 3×491723³ = 356683338140250201, which contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491692 and 491701.

It is not an unprimeable number, because it can be changed into a prime (491773) 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, 473 + ... + 1098.

It is an arithmetic number, because the mean of its divisors is an integer number (123402).

2⁴⁹¹⁷²³ is an apocalyptic number.

491723 is a deficient number, since it is larger than the sum of its proper divisors (1885).

491723 is a wasteful number, since it uses less digits than its factorization.

491723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1884.

The product of its digits is 1512, while the sum is 26.

The square root of 491723 is about 701.2296342854. The cubic root of 491723 is about 78.9296494894.

The spelling of 491723 in words is "four hundred ninety-one thousand, seven hundred twenty-three".