491431583 has 4 divisors (see below), whose sum is σ = 491476608. Its totient is φ = 491386560.

The previous prime is 491431573. The next prime is 491431601. The reversal of 491431583 is 385134194.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 385134194 = 2 ⋅192567097.

It is a cyclic number.

It is not a de Polignac number, because 491431583 - 2⁸ = 491431327 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 (491431573) 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 3 ways as a sum of consecutive naturals, for example, 5378 + ... + 31808.

It is an arithmetic number, because the mean of its divisors is an integer number (122869152).

Almost surely, 2^491431583 is an apocalyptic number.

491431583 is a deficient number, since it is larger than the sum of its proper divisors (45025).

491431583 is a wasteful number, since it uses less digits than its factorization.

491431583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45024.

The product of its digits is 51840, while the sum is 38.

The square root of 491431583 is about 22168.2562011539. The cubic root of 491431583 is about 789.1405399686.

The spelling of 491431583 in words is "four hundred ninety-one million, four hundred thirty-one thousand, five hundred eighty-three".