491903503 has 32 divisors (see below), whose sum is σ = 624153600. Its totient is φ = 385187040.

The previous prime is 491903479. The next prime is 491903509. The reversal of 491903503 is 305309194.

It is not a de Polignac number, because 491903503 - 2¹⁷ = 491772431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491903509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 476598 + ... + 477628.

It is an arithmetic number, because the mean of its divisors is an integer number (19504800).

Almost surely, 2^491903503 is an apocalyptic number.

491903503 is a deficient number, since it is larger than the sum of its proper divisors (132250097).

491903503 is a wasteful number, since it uses less digits than its factorization.

491903503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172 (or 1158 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 491903503 is about 22178.8976957828. The cubic root of 491903503 is about 789.3930621044.

The spelling of 491903503 in words is "four hundred ninety-one million, nine hundred three thousand, five hundred three".