81430603 has 4 divisors (see below), whose sum is σ = 84971088. Its totient is φ = 77890120.

The previous prime is 81430589. The next prime is 81430607. The reversal of 81430603 is 30603418.

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

It is a cyclic number.

It is not a de Polignac number, because 81430603 - 2¹⁷ = 81299531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81430607) 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, 1770208 + ... + 1770253.

It is an arithmetic number, because the mean of its divisors is an integer number (21242772).

Almost surely, 2^81430603 is an apocalyptic number.

81430603 is a deficient number, since it is larger than the sum of its proper divisors (3540485).

81430603 is a wasteful number, since it uses less digits than its factorization.

81430603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3540484.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 81430603 is about 9023.8906797456. The cubic root of 81430603 is about 433.4402287897.

The spelling of 81430603 in words is "eighty-one million, four hundred thirty thousand, six hundred three".