499994991 has 16 divisors (see below), whose sum is σ = 741421920. Its totient is φ = 333020160.

The previous prime is 499994987. The next prime is 499995037. The reversal of 499994991 is 199499994.

It is not a de Polignac number, because 499994991 - 2² = 499994987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (499994921) 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, 23101 + ... + 39161.

It is an arithmetic number, because the mean of its divisors is an integer number (46338870).

Almost surely, 2^499994991 is an apocalyptic number.

499994991 is a deficient number, since it is larger than the sum of its proper divisors (241426929).

499994991 is a wasteful number, since it uses less digits than its factorization.

499994991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17223 (or 17217 counting only the distinct ones).

The product of its digits is 8503056, while the sum is 63.

The square root of 499994991 is about 22360.5677700724. The cubic root of 499994991 is about 793.6978755446.

The spelling of 499994991 in words is "four hundred ninety-nine million, nine hundred ninety-four thousand, nine hundred ninety-one".