491923 has 2 divisors, whose sum is σ = 491924. Its totient is φ = 491922.

The previous prime is 491899. The next prime is 491951. The reversal of 491923 is 329194.

It is a happy number.

It is an a-pointer prime, because the next prime (491951) can be obtained adding 491923 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491923 - 2¹⁷ = 360851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 491891 and 491900.

It is not a weakly prime, because it can be changed into another prime (491983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245961 + 245962.

It is an arithmetic number, because the mean of its divisors is an integer number (245962).

2⁴⁹¹⁹²³ is an apocalyptic number.

491923 is a deficient number, since it is larger than the sum of its proper divisors (1).

491923 is an equidigital number, since it uses as much as digits as its factorization.

491923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 28.

The square root of 491923 is about 701.3722264247. The cubic root of 491923 is about 78.9403491381.

The spelling of 491923 in words is "four hundred ninety-one thousand, nine hundred twenty-three".