491517477 has 40 divisors (see below), whose sum is σ = 819683040. Its totient is φ = 290939040.

The previous prime is 491517469. The next prime is 491517497. The reversal of 491517477 is 774715194.

491517477 is a `hidden beast` number, since 4 + 91 + 517 + 47 + 7 = 666.

It is not a de Polignac number, because 491517477 - 2³ = 491517469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491517407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 31899 + ... + 44727.

It is an arithmetic number, because the mean of its divisors is an integer number (20492076).

Almost surely, 2^491517477 is an apocalyptic number.

It is an amenable number.

491517477 is a deficient number, since it is larger than the sum of its proper divisors (328165563).

491517477 is a wasteful number, since it uses less digits than its factorization.

491517477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12895 (or 12886 counting only the distinct ones).

The product of its digits is 246960, while the sum is 45.

The square root of 491517477 is about 22170.1934362333. The cubic root of 491517477 is about 789.1865134681.

The spelling of 491517477 in words is "four hundred ninety-one million, five hundred seventeen thousand, four hundred seventy-seven".