81335603 has 8 divisors (see below), whose sum is σ = 82355616. Its totient is φ = 80320000.

The previous prime is 81335591. The next prime is 81335609. The reversal of 81335603 is 30653318.

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 81335603 - 2⁶ = 81335539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81335609) 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, 50003 + ... + 51603.

It is an arithmetic number, because the mean of its divisors is an integer number (10294452).

Almost surely, 2^81335603 is an apocalyptic number.

81335603 is a deficient number, since it is larger than the sum of its proper divisors (1020013).

81335603 is a wasteful number, since it uses less digits than its factorization.

81335603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2205.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 81335603 is about 9018.6253387088. The cubic root of 81335603 is about 433.2716073157.

The spelling of 81335603 in words is "eighty-one million, three hundred thirty-five thousand, six hundred three".