489999991 has 8 divisors (see below), whose sum is σ = 541954784. Its totient is φ = 440082720.

The previous prime is 489999977. The next prime is 489999997. The reversal of 489999991 is 199999984.

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

It is a cyclic number.

It is not a de Polignac number, because 489999991 - 2²⁷ = 355782263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (489999997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 508875 + ... + 509836.

It is an arithmetic number, because the mean of its divisors is an integer number (67744348).

Almost surely, 2^489999991 is an apocalyptic number.

489999991 is a deficient number, since it is larger than the sum of its proper divisors (51954793).

489999991 is a wasteful number, since it uses less digits than its factorization.

489999991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018761.

The product of its digits is 17006112, while the sum is 67.

The square root of 489999991 is about 22135.9434178894. The cubic root of 489999991 is about 788.3735114837.

It can be divided in two parts, 48999999 and 1, that added together give a square (49000000 = 7000²).

The spelling of 489999991 in words is "four hundred eighty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-one".