999138487733 has 4 divisors (see below), whose sum is σ = 999413206380. Its totient is φ = 998863769088.

The previous prime is 999138487709. The next prime is 999138487741. The reversal of 999138487733 is 337784831999.

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

It can be written as a sum of positive squares in 2 ways, for example, as 277525615249 + 721612872484 = 526807^2 + 849478^2 .

It is a cyclic number.

It is not a de Polignac number, because 999138487733 - 2¹⁶ = 999138422197 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 (999138487703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137353868 + ... + 137361141.

It is an arithmetic number, because the mean of its divisors is an integer number (249853301595).

Almost surely, 2^999138487733 is an apocalyptic number.

It is an amenable number.

999138487733 is a deficient number, since it is larger than the sum of its proper divisors (274718647).

999138487733 is a wasteful number, since it uses less digits than its factorization.

999138487733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274718646.

The product of its digits is 246903552, while the sum is 71.

The spelling of 999138487733 in words is "nine hundred ninety-nine billion, one hundred thirty-eight million, four hundred eighty-seven thousand, seven hundred thirty-three".