81016503 has 8 divisors (see below), whose sum is σ = 108260208. Its totient is φ = 53891904.

The previous prime is 81016493. The next prime is 81016531. The reversal of 81016503 is 30561018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81016503 - 2⁴ = 81016487 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81026503) 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, 28176 + ... + 30917.

It is an arithmetic number, because the mean of its divisors is an integer number (13532526).

Almost surely, 2^81016503 is an apocalyptic number.

81016503 is a deficient number, since it is larger than the sum of its proper divisors (27243705).

81016503 is a wasteful number, since it uses less digits than its factorization.

81016503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59553.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 81016503 is about 9000.9167866390. The cubic root of 81016503 is about 432.7042535964.

The spelling of 81016503 in words is "eighty-one million, sixteen thousand, five hundred three".