491045989 has 8 divisors (see below), whose sum is σ = 573136128. Its totient is φ = 411941040.

The previous prime is 491045987. The next prime is 491046001. The reversal of 491045989 is 989540194.

It is a happy number.

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

It is not a de Polignac number, because 491045989 - 2¹ = 491045987 is a prime.

It is a super-2 number, since 2×491045989² = 482252326625976242, 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 (491045987) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 745942 + ... + 746599.

It is an arithmetic number, because the mean of its divisors is an integer number (71642016).

Almost surely, 2^491045989 is an apocalyptic number.

It is an amenable number.

491045989 is a deficient number, since it is larger than the sum of its proper divisors (82090139).

491045989 is a wasteful number, since it uses less digits than its factorization.

491045989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492595.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 491045989 is about 22159.5575091201. The cubic root of 491045989 is about 788.9340904258.

The spelling of 491045989 in words is "four hundred ninety-one million, forty-five thousand, nine hundred eighty-nine".