491951603 has 16 divisors (see below), whose sum is σ = 580586496. Its totient is φ = 410948640.

The previous prime is 491951597. The next prime is 491951609. The reversal of 491951603 is 306159194.

It is an interprime number because it is at equal distance from previous prime (491951597) and next prime (491951609).

It is a cyclic number.

It is not a de Polignac number, because 491951603 - 2²⁶ = 424842739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491951609) 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 15 ways as a sum of consecutive naturals, for example, 24176 + ... + 39602.

It is an arithmetic number, because the mean of its divisors is an integer number (36286656).

Almost surely, 2^491951603 is an apocalyptic number.

491951603 is a deficient number, since it is larger than the sum of its proper divisors (88634893).

491951603 is a wasteful number, since it uses less digits than its factorization.

491951603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15674.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 491951603 is about 22179.9820333561. The cubic root of 491951603 is about 789.4187911133.

The spelling of 491951603 in words is "four hundred ninety-one million, nine hundred fifty-one thousand, six hundred three".