491657223 has 24 divisors (see below), whose sum is σ = 694657152. Its totient is φ = 308686048.

The previous prime is 491657209. The next prime is 491657239. The reversal of 491657223 is 322756194.

It is not a de Polignac number, because 491657223 - 2¹⁴ = 491640839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491657273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1677865 + ... + 1678157.

It is an arithmetic number, because the mean of its divisors is an integer number (28944048).

Almost surely, 2^491657223 is an apocalyptic number.

491657223 is a deficient number, since it is larger than the sum of its proper divisors (202999929).

491657223 is an equidigital number, since it uses as much as digits as its factorization.

491657223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695 (or 402 counting only the distinct ones).

The product of its digits is 90720, while the sum is 39.

The square root of 491657223 is about 22173.3448762247. The cubic root of 491657223 is about 789.2612990138.

The spelling of 491657223 in words is "four hundred ninety-one million, six hundred fifty-seven thousand, two hundred twenty-three".