81694603 has 4 divisors (see below), whose sum is σ = 81757768. Its totient is φ = 81631440.

The previous prime is 81694583. The next prime is 81694619. The reversal of 81694603 is 30649618.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81694603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81694663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29601 + ... + 32242.

It is an arithmetic number, because the mean of its divisors is an integer number (20439442).

Almost surely, 2^81694603 is an apocalyptic number.

81694603 is a deficient number, since it is larger than the sum of its proper divisors (63165).

81694603 is a wasteful number, since it uses less digits than its factorization.

81694603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63164.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 81694603 is about 9038.5066797563. The cubic root of 81694603 is about 433.9081314322.

The spelling of 81694603 in words is "eighty-one million, six hundred ninety-four thousand, six hundred three".