81033535 has 16 divisors (see below), whose sum is σ = 109504512. Its totient is φ = 57031200.

The previous prime is 81033529. The next prime is 81033541. The reversal of 81033535 is 53533018.

It is an interprime number because it is at equal distance from previous prime (81033529) and next prime (81033541).

It is not a de Polignac number, because 81033535 - 2⁵ = 81033503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22059 + ... + 25468.

It is an arithmetic number, because the mean of its divisors is an integer number (6844032).

Almost surely, 2^81033535 is an apocalyptic number.

81033535 is a deficient number, since it is larger than the sum of its proper divisors (28470977).

81033535 is a wasteful number, since it uses less digits than its factorization.

81033535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47574.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 81033535 is about 9001.8628627635. The cubic root of 81033535 is about 432.7345737665.

The spelling of 81033535 in words is "eighty-one million, thirty-three thousand, five hundred thirty-five".