497791891 has 4 divisors (see below), whose sum is σ = 504611032. Its totient is φ = 490972752.

The previous prime is 497791883. The next prime is 497791897. The reversal of 497791891 is 198197794.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198197794 = 2 ⋅99098897.

It is a cyclic number.

It is not a de Polignac number, because 497791891 - 2³ = 497791883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (497791897) 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, 3409461 + ... + 3409606.

It is an arithmetic number, because the mean of its divisors is an integer number (126152758).

Almost surely, 2^497791891 is an apocalyptic number.

497791891 is a deficient number, since it is larger than the sum of its proper divisors (6819141).

497791891 is an equidigital number, since it uses as much as digits as its factorization.

497791891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6819140.

The product of its digits is 1143072, while the sum is 55.

The square root of 497791891 is about 22311.2503235475. The cubic root of 497791891 is about 792.5304169546.

The spelling of 497791891 in words is "four hundred ninety-seven million, seven hundred ninety-one thousand, eight hundred ninety-one".