81833369 has 4 divisors (see below), whose sum is σ = 81878580. Its totient is φ = 81788160.

The previous prime is 81833363. The next prime is 81833383. The reversal of 81833369 is 96333818.

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 57577744 + 24255625 = 7588^2 + 4925^2 .

It is a cyclic number.

It is not a de Polignac number, because 81833369 - 2¹² = 81829273 is a prime.

It is a super-2 number, since 2×81833369² = 13393400563780322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81833363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19772 + ... + 23549.

It is an arithmetic number, because the mean of its divisors is an integer number (20469645).

Almost surely, 2^81833369 is an apocalyptic number.

It is an amenable number.

81833369 is a deficient number, since it is larger than the sum of its proper divisors (45211).

81833369 is a wasteful number, since it uses less digits than its factorization.

81833369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45210.

The product of its digits is 93312, while the sum is 41.

The square root of 81833369 is about 9046.1798014410. The cubic root of 81833369 is about 434.1536704435.

The spelling of 81833369 in words is "eighty-one million, eight hundred thirty-three thousand, three hundred sixty-nine".