999534607891597 has 4 divisors (see below), whose sum is σ = 999534686930140. Its totient is φ = 999534528853056.

The previous prime is 999534607891591. The next prime is 999534607891649. The reversal of 999534607891597 is 795198706435999.

999534607891597 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 446127520436361 + 553407087455236 = 21121731^2 + 23524606^2 .

It is a 3-Lehmer number, since φ(999534607891597) divides (999534607891597-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999534607891597 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 (999534607891591) 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, 15807708 + ... + 47423125.

It is an arithmetic number, because the mean of its divisors is an integer number (249883671732535).

It is a Poulet number, since it divides 2^{999534607891596}-1.

Almost surely, 2^{999534607891597} is an apocalyptic number.

999534607891597 is the 15807709-th decagonal number.

It is an amenable number.

999534607891597 is a deficient number, since it is larger than the sum of its proper divisors (79038543).

999534607891597 is a wasteful number, since it uses less digits than its factorization.

999534607891597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79038542.

The product of its (nonzero) digits is 41664974400, while the sum is 91.

The spelling of 999534607891597 in words is "nine hundred ninety-nine trillion, five hundred thirty-four billion, six hundred seven million, eight hundred ninety-one thousand, five hundred ninety-seven".