491181336 has 24 divisors (see below), whose sum is σ = 1330282980. Its totient is φ = 163727088.

The previous prime is 491181319. The next prime is 491181343. The reversal of 491181336 is 633181194.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 491181336.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3410910 + ... + 3411053.

Almost surely, 2^491181336 is an apocalyptic number.

It is an amenable number.

491181336 is an abundant number, since it is smaller than the sum of its proper divisors (839101644).

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

491181336 is a wasteful number, since it uses less digits than its factorization.

491181336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6821975 (or 6821968 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 491181336 is about 22162.6112179950. The cubic root of 491181336 is about 789.0065683984.

The spelling of 491181336 in words is "four hundred ninety-one million, one hundred eighty-one thousand, three hundred thirty-six".