491975777 has 4 divisors (see below), whose sum is σ = 497903280. Its totient is φ = 486048276.

The previous prime is 491975761. The next prime is 491975831. The reversal of 491975777 is 777579194.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 491975777 - 2⁴ = 491975761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491975377) 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, 2963627 + ... + 2963792.

It is an arithmetic number, because the mean of its divisors is an integer number (124475820).

Almost surely, 2^491975777 is an apocalyptic number.

It is an amenable number.

491975777 is a deficient number, since it is larger than the sum of its proper divisors (5927503).

491975777 is an equidigital number, since it uses as much as digits as its factorization.

491975777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5927502.

The product of its digits is 3889620, while the sum is 56.

The square root of 491975777 is about 22180.5269775089. The cubic root of 491975777 is about 789.4317213129.

The spelling of 491975777 in words is "four hundred ninety-one million, nine hundred seventy-five thousand, seven hundred seventy-seven".