999533381 has 16 divisors (see below), whose sum is σ = 1247920128. Its totient is φ = 777764400.

The previous prime is 999533351. The next prime is 999533389. The reversal of 999533381 is 183335999.

It is a de Polignac number, because none of the positive numbers 2^k-999533381 is a prime.

It is a super-2 number, since 2×999533381² = 1998133959466582322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999533389) 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 15 ways as a sum of consecutive naturals, for example, 48476 + ... + 65946.

It is an arithmetic number, because the mean of its divisors is an integer number (77995008).

Almost surely, 2^999533381 is an apocalyptic number.

It is an amenable number.

999533381 is a deficient number, since it is larger than the sum of its proper divisors (248386747).

999533381 is a wasteful number, since it uses less digits than its factorization.

999533381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18232.

The product of its digits is 787320, while the sum is 50.

The square root of 999533381 is about 31615.3978466190. The cubic root of 999533381 is about 999.8444361345.

The spelling of 999533381 in words is "nine hundred ninety-nine million, five hundred thirty-three thousand, three hundred eighty-one".