81503703 has 12 divisors (see below), whose sum is σ = 118029288. Its totient is φ = 54196560.

The previous prime is 81503701. The next prime is 81503713. The reversal of 81503703 is 30730518.

It is not a de Polignac number, because 81503703 - 2¹ = 81503701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81503701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7833 + ... + 14978.

It is an arithmetic number, because the mean of its divisors is an integer number (9835774).

Almost surely, 2^81503703 is an apocalyptic number.

81503703 is a deficient number, since it is larger than the sum of its proper divisors (36525585).

81503703 is a wasteful number, since it uses less digits than its factorization.

81503703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23214 (or 23211 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 81503703 is about 9027.9401305060. The cubic root of 81503703 is about 433.5698893157.

The spelling of 81503703 in words is "eighty-one million, five hundred three thousand, seven hundred three".