491009490 has 96 divisors (see below), whose sum is σ = 1318187520. Its totient is φ = 126741888.

The previous prime is 491009479. The next prime is 491009501. The reversal of 491009490 is 94900194.

It is an interprime number because it is at equal distance from previous prime (491009479) and next prime (491009501).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 376179 + ... + 377481.

It is an arithmetic number, because the mean of its divisors is an integer number (13731120).

Almost surely, 2^491009490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491009490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (659093760).

491009490 is an abundant number, since it is smaller than the sum of its proper divisors (827178030).

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

491009490 is a wasteful number, since it uses less digits than its factorization.

491009490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448 (or 1445 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 491009490 is about 22158.7339439779. The cubic root of 491009490 is about 788.9145430246.

The spelling of 491009490 in words is "four hundred ninety-one million, nine thousand, four hundred ninety".