491164923 has 16 divisors (see below), whose sum is σ = 666519840. Its totient is φ = 321674496.

The previous prime is 491164907. The next prime is 491164937. The reversal of 491164923 is 329461194.

It is not a de Polignac number, because 491164923 - 2⁴ = 491164907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491164943) 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, 36061 + ... + 47777.

It is an arithmetic number, because the mean of its divisors is an integer number (41657490).

Almost surely, 2^491164923 is an apocalyptic number.

491164923 is a deficient number, since it is larger than the sum of its proper divisors (175354917).

491164923 is a wasteful number, since it uses less digits than its factorization.

491164923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11966.

The product of its digits is 46656, while the sum is 39.

The square root of 491164923 is about 22162.2409291118. The cubic root of 491164923 is about 788.9977799883.

The spelling of 491164923 in words is "four hundred ninety-one million, one hundred sixty-four thousand, nine hundred twenty-three".