491609904 has 40 divisors (see below), whose sum is σ = 1310963712. Its totient is φ = 158583360.

The previous prime is 491609891. The next prime is 491609917. The reversal of 491609904 is 409906194.

It is an interprime number because it is at equal distance from previous prime (491609891) and next prime (491609917).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163704 + ... + 166679.

Almost surely, 2^491609904 is an apocalyptic number.

It is an amenable number.

491609904 is an abundant number, since it is smaller than the sum of its proper divisors (819353808).

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

491609904 is a wasteful number, since it uses less digits than its factorization.

491609904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330425 (or 330419 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 491609904 is about 22172.2778261504. The cubic root of 491609904 is about 789.2359776775.

The spelling of 491609904 in words is "four hundred ninety-one million, six hundred nine thousand, nine hundred four".