491488477 has 4 divisors (see below), whose sum is σ = 507342976. Its totient is φ = 475633980.

The previous prime is 491488471. The next prime is 491488493. The reversal of 491488477 is 774884194.

It is a happy number.

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 491488477 - 2³ = 491488469 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 (491488471) 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, 7927203 + ... + 7927264.

It is an arithmetic number, because the mean of its divisors is an integer number (126835744).

Almost surely, 2^491488477 is an apocalyptic number.

It is an amenable number.

491488477 is a deficient number, since it is larger than the sum of its proper divisors (15854499).

491488477 is a wasteful number, since it uses less digits than its factorization.

491488477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15854498.

The product of its digits is 1806336, while the sum is 52.

The square root of 491488477 is about 22169.5393953054. The cubic root of 491488477 is about 789.1709922438.

The spelling of 491488477 in words is "four hundred ninety-one million, four hundred eighty-eight thousand, four hundred seventy-seven".