81252503 has 8 divisors (see below), whose sum is σ = 86421888. Its totient is φ = 76126464.

The previous prime is 81252467. The next prime is 81252511. The reversal of 81252503 is 30525218.

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 81252503 - 2⁸ = 81252247 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81252593) 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, 6926 + ... + 14507.

It is an arithmetic number, because the mean of its divisors is an integer number (10802736).

Almost surely, 2^81252503 is an apocalyptic number.

81252503 is a deficient number, since it is larger than the sum of its proper divisors (5169385).

81252503 is a wasteful number, since it uses less digits than its factorization.

81252503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21673.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 81252503 is about 9014.0170290498. The cubic root of 81252503 is about 433.1240002073.

The spelling of 81252503 in words is "eighty-one million, two hundred fifty-two thousand, five hundred three".