491806902 has 8 divisors (see below), whose sum is σ = 983613816. Its totient is φ = 163935632.

The previous prime is 491806897. The next prime is 491806937. The reversal of 491806902 is 209608194.

It is a sphenic number, since it is the product of 3 distinct primes.

491806902 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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, 40983903 + ... + 40983914.

It is an arithmetic number, because the mean of its divisors is an integer number (122951727).

Almost surely, 2^491806902 is an apocalyptic number.

491806902 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

491806902 is a wasteful number, since it uses less digits than its factorization.

491806902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81967822.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 491806902 is about 22176.7198205686. The cubic root of 491806902 is about 789.3413845220.

The spelling of 491806902 in words is "four hundred ninety-one million, eight hundred six thousand, nine hundred two".