81697603 has 8 divisors (see below), whose sum is σ = 88805808. Its totient is φ = 74707104.

The previous prime is 81697601. The next prime is 81697607. The reversal of 81697603 is 30679618.

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 81697603 - 2¹ = 81697601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81697601) 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, 27976 + ... + 30757.

It is an arithmetic number, because the mean of its divisors is an integer number (11100726).

Almost surely, 2^81697603 is an apocalyptic number.

81697603 is a deficient number, since it is larger than the sum of its proper divisors (7108205).

81697603 is a wasteful number, since it uses less digits than its factorization.

81697603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58853.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 81697603 is about 9038.6726348508. The cubic root of 81697603 is about 433.9134427111.

The spelling of 81697603 in words is "eighty-one million, six hundred ninety-seven thousand, six hundred three".