81033337 has 24 divisors (see below), whose sum is σ = 105336000. Its totient is φ = 60947040.

The previous prime is 81033307. The next prime is 81033353. The reversal of 81033337 is 73333018.

It is not a de Polignac number, because 81033337 - 2¹¹ = 81031289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81033307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22914 + ... + 26212.

It is an arithmetic number, because the mean of its divisors is an integer number (4389000).

Almost surely, 2^81033337 is an apocalyptic number.

It is an amenable number.

81033337 is a deficient number, since it is larger than the sum of its proper divisors (24302663).

81033337 is a wasteful number, since it uses less digits than its factorization.

81033337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3357 (or 3346 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 81033337 is about 9001.8518650331. The cubic root of 81033337 is about 432.7342213136.

The spelling of 81033337 in words is "eighty-one million, thirty-three thousand, three hundred thirty-seven".