497611991 has 4 divisors (see below), whose sum is σ = 498304800. Its totient is φ = 496919184.

The previous prime is 497611973. The next prime is 497611993. The reversal of 497611991 is 199116794.

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 497611991 - 2¹⁸ = 497349847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (497611993) 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, 345326 + ... + 346763.

It is an arithmetic number, because the mean of its divisors is an integer number (124576200).

Almost surely, 2^497611991 is an apocalyptic number.

497611991 is a deficient number, since it is larger than the sum of its proper divisors (692809).

497611991 is an equidigital number, since it uses as much as digits as its factorization.

497611991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692808.

The product of its digits is 122472, while the sum is 47.

The square root of 497611991 is about 22307.2183608804. The cubic root of 497611991 is about 792.4349330094.

The spelling of 497611991 in words is "four hundred ninety-seven million, six hundred eleven thousand, nine hundred ninety-one".