491039591 has 16 divisors (see below), whose sum is σ = 592454400. Its totient is φ = 397571328.

The previous prime is 491039573. The next prime is 491039599. The reversal of 491039591 is 195930194.

It is a de Polignac number, because none of the positive numbers 2^k-491039591 is a prime.

It is a super-2 number, since 2×491039591² = 482239759858894562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491039599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41720 + ... + 52178.

It is an arithmetic number, because the mean of its divisors is an integer number (37028400).

Almost surely, 2^491039591 is an apocalyptic number.

491039591 is a deficient number, since it is larger than the sum of its proper divisors (101414809).

491039591 is a wasteful number, since it uses less digits than its factorization.

491039591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10838.

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 491039591 is about 22159.4131465614. The cubic root of 491039591 is about 788.9306639835.

The spelling of 491039591 in words is "four hundred ninety-one million, thirty-nine thousand, five hundred ninety-one".