491937658403 has 4 divisors (see below), whose sum is σ = 493164436008. Its totient is φ = 490710880800.

The previous prime is 491937658379. The next prime is 491937658411. The reversal of 491937658403 is 304856739194.

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 491937658403 - 2¹⁴ = 491937642019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491937658463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 613388201 + ... + 613389002.

It is an arithmetic number, because the mean of its divisors is an integer number (123291109002).

Almost surely, 2^491937658403 is an apocalyptic number.

491937658403 is a deficient number, since it is larger than the sum of its proper divisors (1226777605).

491937658403 is a wasteful number, since it uses less digits than its factorization.

491937658403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226777604.

The product of its (nonzero) digits is 19595520, while the sum is 59.

The spelling of 491937658403 in words is "four hundred ninety-one billion, nine hundred thirty-seven million, six hundred fifty-eight thousand, four hundred three".