81344503 has 4 divisors (see below), whose sum is σ = 82104840. Its totient is φ = 80584168.

The previous prime is 81344479. The next prime is 81344521. The reversal of 81344503 is 30544318.

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 81344503 - 2⁹ = 81343991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81344563) 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, 380008 + ... + 380221.

It is an arithmetic number, because the mean of its divisors is an integer number (20526210).

Almost surely, 2^81344503 is an apocalyptic number.

81344503 is a deficient number, since it is larger than the sum of its proper divisors (760337).

81344503 is a wasteful number, since it uses less digits than its factorization.

81344503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760336.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 81344503 is about 9019.1187485253. The cubic root of 81344503 is about 433.2874100578.

The spelling of 81344503 in words is "eighty-one million, three hundred forty-four thousand, five hundred three".