81733445 has 4 divisors (see below), whose sum is σ = 98080140. Its totient is φ = 65386752.

The previous prime is 81733441. The next prime is 81733451. The reversal of 81733445 is 54433718.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54433718 = 2 ⋅27216859.

It can be written as a sum of positive squares in 2 ways, for example, as 44742721 + 36990724 = 6689^2 + 6082^2 .

It is a cyclic number.

It is not a de Polignac number, because 81733445 - 2² = 81733441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81733441) 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, 8173340 + ... + 8173349.

It is an arithmetic number, because the mean of its divisors is an integer number (24520035).

Almost surely, 2^81733445 is an apocalyptic number.

It is an amenable number.

81733445 is a deficient number, since it is larger than the sum of its proper divisors (16346695).

81733445 is a wasteful number, since it uses less digits than its factorization.

81733445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16346694.

The product of its digits is 40320, while the sum is 35.

The square root of 81733445 is about 9040.6551200674. The cubic root of 81733445 is about 433.9768882764.

The spelling of 81733445 in words is "eighty-one million, seven hundred thirty-three thousand, four hundred forty-five".