491591030 has 64 divisors (see below), whose sum is σ = 1037836800. Its totient is φ = 167580000.

The previous prime is 491591027. The next prime is 491591033. The reversal of 491591030 is 30195194.

It is an interprime number because it is at equal distance from previous prime (491591027) and next prime (491591033).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491591033) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 860645 + ... + 861215.

It is an arithmetic number, because the mean of its divisors is an integer number (16216200).

Almost surely, 2^491591030 is an apocalyptic number.

491591030 is an abundant number, since it is smaller than the sum of its proper divisors (546245770).

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

491591030 is a wasteful number, since it uses less digits than its factorization.

491591030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850 (or 836 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 491591030 is about 22171.8522004816. The cubic root of 491591030 is about 789.2258773721.

The spelling of 491591030 in words is "four hundred ninety-one million, five hundred ninety-one thousand, thirty".