81975603 has 16 divisors (see below), whose sum is σ = 111628800. Its totient is φ = 53494560.

The previous prime is 81975583. The next prime is 81975613. The reversal of 81975603 is 30657918.

It is not a de Polignac number, because 81975603 - 2⁵ = 81975571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81975613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47113 + ... + 48821.

It is an arithmetic number, because the mean of its divisors is an integer number (6976800).

Almost surely, 2^81975603 is an apocalyptic number.

81975603 is a deficient number, since it is larger than the sum of its proper divisors (29653197).

81975603 is a wasteful number, since it uses less digits than its factorization.

81975603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 81975603 is about 9054.0379389530. The cubic root of 81975603 is about 434.4050579962.

The spelling of 81975603 in words is "eighty-one million, nine hundred seventy-five thousand, six hundred three".