506490918491 has 4 divisors (see below), whose sum is σ = 520179862272. Its totient is φ = 492801974712.

The previous prime is 506490918473. The next prime is 506490918499. The reversal of 506490918491 is 194819094605.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 506490918491 - 2³⁸ = 231613011547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (506490918499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6844471835 + ... + 6844471908.

It is an arithmetic number, because the mean of its divisors is an integer number (130044965568).

Almost surely, 2^506490918491 is an apocalyptic number.

506490918491 is a deficient number, since it is larger than the sum of its proper divisors (13688943781).

506490918491 is a wasteful number, since it uses less digits than its factorization.

506490918491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13688943780.

The product of its (nonzero) digits is 2799360, while the sum is 56.

The spelling of 506490918491 in words is "five hundred six billion, four hundred ninety million, nine hundred eighteen thousand, four hundred ninety-one".