497991 has 12 divisors (see below), whose sum is σ = 721448. Its totient is φ = 303744.

The previous prime is 497989. The next prime is 497993. The reversal of 497991 is 199794.

It is an interprime number because it is at equal distance from previous prime (497989) and next prime (497993).

It is not a de Polignac number, because 497991 - 2¹ = 497989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 497991.

It is not an unprimeable number, because it can be changed into a prime (497993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4351 + ... + 4463.

2⁴⁹⁷⁹⁹¹ is an apocalyptic number.

497991 is a deficient number, since it is larger than the sum of its proper divisors (223457).

497991 is a wasteful number, since it uses less digits than its factorization.

497991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242 (or 129 counting only the distinct ones).

The product of its digits is 20412, while the sum is 39.

The square root of 497991 is about 705.6847738190. The cubic root of 497991 is about 79.2636069475.

Multiplying 497991 by its sum of digits (39), we get a square (19421649 = 4407²).

497991 divided by its sum of digits (39) gives a square (12769 = 113²).

The spelling of 497991 in words is "four hundred ninety-seven thousand, nine hundred ninety-one".