999968571 has 36 divisors (see below), whose sum is σ = 1714223472. Its totient is φ = 571384368.

The previous prime is 999968561. The next prime is 999968573. The reversal of 999968571 is 175869999.

It is not a de Polignac number, because 999968571 - 2¹⁷ = 999837499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 999968499 and 999968508.

It is not an unprimeable number, because it can be changed into a prime (999968573) 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 35 ways as a sum of consecutive naturals, for example, 35041 + ... + 56813.

Almost surely, 2^999968571 is an apocalyptic number.

999968571 is a deficient number, since it is larger than the sum of its proper divisors (714254901).

999968571 is an frugal number, since it uses more digits than its factorization.

999968571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21804 (or 21783 counting only the distinct ones).

The product of its digits is 11022480, while the sum is 63.

The square root of 999968571 is about 31622.2796616563. The cubic root of 999968571 is about 999.9895235569.

The spelling of 999968571 in words is "nine hundred ninety-nine million, nine hundred sixty-eight thousand, five hundred seventy-one".