1047816899 has 4 divisors (see below), whose sum is σ = 1047881640. Its totient is φ = 1047752160.

The previous prime is 1047816877. The next prime is 1047816907. The reversal of 1047816899 is 9986187401.

It is a Cunningham number, because it is equal to 32370²-1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9986187401 = 10663 ⋅936527.

It is a cyclic number.

It is not a de Polignac number, because 1047816899 - 2⁸ = 1047816643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1047816899.

It is not an unprimeable number, because it can be changed into a prime (1047810899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16184 + ... + 48554.

It is an arithmetic number, because the mean of its divisors is an integer number (261970410).

Almost surely, 2^1047816899 is an apocalyptic number.

1047816899 is a deficient number, since it is larger than the sum of its proper divisors (64741).

1047816899 is an equidigital number, since it uses as much as digits as its factorization.

1047816899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64740.

The product of its (nonzero) digits is 870912, while the sum is 53.

The square root of 1047816899 is about 32369.9999845536. Note that the first 4 decimals coincide. The cubic root of 1047816899 is about 1015.6914566615.

The spelling of 1047816899 in words is "one billion, forty-seven million, eight hundred sixteen thousand, eight hundred ninety-nine".