491617502903 has 2 divisors, whose sum is σ = 491617502904. Its totient is φ = 491617502902.

The previous prime is 491617502881. The next prime is 491617502911. The reversal of 491617502903 is 309205716194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491617502903 - 2²⁴ = 491600725687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491617502933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245808751451 + 245808751452.

It is an arithmetic number, because the mean of its divisors is an integer number (245808751452).

Almost surely, 2^491617502903 is an apocalyptic number.

491617502903 is a deficient number, since it is larger than the sum of its proper divisors (1).

491617502903 is an equidigital number, since it uses as much as digits as its factorization.

491617502903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 47.

The spelling of 491617502903 in words is "four hundred ninety-one billion, six hundred seventeen million, five hundred two thousand, nine hundred three".