499980991 has 4 divisors (see below), whose sum is σ = 526295800. Its totient is φ = 473666184.

The previous prime is 499980983. The next prime is 499980997. The reversal of 499980991 is 199089994.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 499980991 - 2³ = 499980983 is a prime.

It is a super-2 number, since 2×499980991² = 499961982722684162, 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 (499980997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13157376 + ... + 13157413.

It is an arithmetic number, because the mean of its divisors is an integer number (131573950).

Almost surely, 2^499980991 is an apocalyptic number.

499980991 is a deficient number, since it is larger than the sum of its proper divisors (26314809).

499980991 is a wasteful number, since it uses less digits than its factorization.

499980991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26314808.

The product of its (nonzero) digits is 1889568, while the sum is 58.

The square root of 499980991 is about 22360.2547167960. The cubic root of 499980991 is about 793.6904675544.

The spelling of 499980991 in words is "four hundred ninety-nine million, nine hundred eighty thousand, nine hundred ninety-one".