491000173 has 4 divisors (see below), whose sum is σ = 494012608. Its totient is φ = 487987740.

The previous prime is 491000119. The next prime is 491000177. The reversal of 491000173 is 371000194.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491000173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491000177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1505973 + ... + 1506298.

It is an arithmetic number, because the mean of its divisors is an integer number (123503152).

Almost surely, 2^491000173 is an apocalyptic number.

It is an amenable number.

491000173 is a deficient number, since it is larger than the sum of its proper divisors (3012435).

491000173 is a wasteful number, since it uses less digits than its factorization.

491000173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3012434.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 491000173 is about 22158.5237098503. The cubic root of 491000173 is about 788.9095530577.

The spelling of 491000173 in words is "four hundred ninety-one million, one hundred seventy-three", and thus it is an aban number.