494989991 has 8 divisors (see below), whose sum is σ = 501022368. Its totient is φ = 488980000.

The previous prime is 494989939. The next prime is 494990011. The reversal of 494989991 is 199989494.

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 494989991 - 2¹⁸ = 494727847 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 (494989921) 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, 41246 + ... + 51876.

It is an arithmetic number, because the mean of its divisors is an integer number (62627796).

Almost surely, 2^494989991 is an apocalyptic number.

494989991 is a deficient number, since it is larger than the sum of its proper divisors (6032377).

494989991 is a wasteful number, since it uses less digits than its factorization.

494989991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11193.

The product of its digits is 7558272, while the sum is 62.

The square root of 494989991 is about 22248.3705246025. The cubic root of 494989991 is about 791.0406576073.

The spelling of 494989991 in words is "four hundred ninety-four million, nine hundred eighty-nine thousand, nine hundred ninety-one".