81569603 has 8 divisors (see below), whose sum is σ = 86442000. Its totient is φ = 76755168.

The previous prime is 81569599. The next prime is 81569611. The reversal of 81569603 is 30696518.

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 81569603 - 2² = 81569599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81569693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11576 + ... + 17237.

It is an arithmetic number, because the mean of its divisors is an integer number (10805250).

Almost surely, 2^81569603 is an apocalyptic number.

81569603 is a deficient number, since it is larger than the sum of its proper divisors (4872397).

81569603 is a wasteful number, since it uses less digits than its factorization.

81569603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28981.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 81569603 is about 9031.5891735619. The cubic root of 81569603 is about 433.6867124676.

The spelling of 81569603 in words is "eighty-one million, five hundred sixty-nine thousand, six hundred three".