491634977 has 4 divisors (see below), whose sum is σ = 503626116. Its totient is φ = 479643840.

The previous prime is 491634931. The next prime is 491634989. The reversal of 491634977 is 779436194.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 779436194 = 2 ⋅389718097.

It can be written as a sum of positive squares in 2 ways, for example, as 52983841 + 438651136 = 7279^2 + 20944^2 .

It is a cyclic number.

It is not a de Polignac number, because 491634977 - 2⁸ = 491634721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491631977) 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 3 ways as a sum of consecutive naturals, for example, 5995508 + ... + 5995589.

It is an arithmetic number, because the mean of its divisors is an integer number (125906529).

Almost surely, 2^491634977 is an apocalyptic number.

It is an amenable number.

491634977 is a deficient number, since it is larger than the sum of its proper divisors (11991139).

491634977 is a wasteful number, since it uses less digits than its factorization.

491634977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11991138.

The product of its digits is 1143072, while the sum is 50.

The square root of 491634977 is about 22172.8432322064. The cubic root of 491634977 is about 789.2493949399.

It can be divided in two parts, 4916 and 34977, that added together give a palindrome (39893).

The spelling of 491634977 in words is "four hundred ninety-one million, six hundred thirty-four thousand, nine hundred seventy-seven".