81248503 has 8 divisors (see below), whose sum is σ = 97742720. Its totient is φ = 65976120.

The previous prime is 81248501. The next prime is 81248507. The reversal of 81248503 is 30584218.

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

It is not a de Polignac number, because 81248503 - 2¹ = 81248501 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 (81248501) 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, 305313 + ... + 305578.

It is an arithmetic number, because the mean of its divisors is an integer number (12217840).

Almost surely, 2^81248503 is an apocalyptic number.

81248503 is a deficient number, since it is larger than the sum of its proper divisors (16494217).

81248503 is a wasteful number, since it uses less digits than its factorization.

81248503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610917.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 81248503 is about 9013.7951496581. The cubic root of 81248503 is about 433.1168926337.

The spelling of 81248503 in words is "eighty-one million, two hundred forty-eight thousand, five hundred three".