81833769 has 12 divisors (see below), whose sum is σ = 122017792. Its totient is φ = 52795800.

The previous prime is 81833761. The next prime is 81833771. The reversal of 81833769 is 96733818.

It is a happy number.

It is not a de Polignac number, because 81833769 - 2³ = 81833761 is a prime.

It is a super-2 number, since 2×81833769² = 13393531497490722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81833761) 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 11 ways as a sum of consecutive naturals, for example, 146377 + ... + 146934.

Almost surely, 2^81833769 is an apocalyptic number.

It is an amenable number.

81833769 is a deficient number, since it is larger than the sum of its proper divisors (40184023).

81833769 is a wasteful number, since it uses less digits than its factorization.

81833769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293348 (or 293345 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 81833769 is about 9046.2019101941. The cubic root of 81833769 is about 434.1543778207.

The spelling of 81833769 in words is "eighty-one million, eight hundred thirty-three thousand, seven hundred sixty-nine".