491699166 has 32 divisors (see below), whose sum is σ = 1125017088. Its totient is φ = 140343840.

The previous prime is 491699123. The next prime is 491699191. The reversal of 491699166 is 661996194.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40551 + ... + 51261.

It is an arithmetic number, because the mean of its divisors is an integer number (35156784).

Almost surely, 2^491699166 is an apocalyptic number.

491699166 is an abundant number, since it is smaller than the sum of its proper divisors (633317922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491699166 is a wasteful number, since it uses less digits than its factorization.

491699166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11816.

The product of its digits is 629856, while the sum is 51.

The square root of 491699166 is about 22174.2906538180. The cubic root of 491699166 is about 789.2837421875.

The spelling of 491699166 in words is "four hundred ninety-one million, six hundred ninety-nine thousand, one hundred sixty-six".