81633803 has 8 divisors (see below), whose sum is σ = 83954160. Its totient is φ = 79319520.

The previous prime is 81633793. The next prime is 81633817. The reversal of 81633803 is 30833618.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81633803 - 2⁴ = 81633787 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81633803.

It is not an unprimeable number, because it can be changed into a prime (81633863) 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 7 ways as a sum of consecutive naturals, for example, 46913 + ... + 48621.

It is an arithmetic number, because the mean of its divisors is an integer number (10494270).

Almost surely, 2^81633803 is an apocalyptic number.

81633803 is a deficient number, since it is larger than the sum of its proper divisors (2320357).

81633803 is a wasteful number, since it uses less digits than its factorization.

81633803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 81633803 is about 9035.1426662782. The cubic root of 81633803 is about 433.8004614808.

The spelling of 81633803 in words is "eighty-one million, six hundred thirty-three thousand, eight hundred three".