1000000499991 has 8 divisors (see below), whose sum is σ = 1411765411824. Its totient is φ = 627451294080.

The previous prime is 1000000499929. The next prime is 1000000500019. The reversal of 1000000499991 is 1999940000001.

1000000499991 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1000000499991 - 2⁹ = 1000000499479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000000499291) 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, 9803926420 + ... + 9803926521.

It is an arithmetic number, because the mean of its divisors is an integer number (176470676478).

Almost surely, 2^{1000000499991} is an apocalyptic number.

1000000499991 is a deficient number, since it is larger than the sum of its proper divisors (411764911833).

1000000499991 is a wasteful number, since it uses less digits than its factorization.

1000000499991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19607852961.

The product of its (nonzero) digits is 26244, while the sum is 42.

Adding to 1000000499991 its reverse (1999940000001), we get a palindrome (2999940499992).

The spelling of 1000000499991 in words is "one trillion, four hundred ninety-nine thousand, nine hundred ninety-one".