81703243 has 8 divisors (see below), whose sum is σ = 82698336. Its totient is φ = 80712000.

The previous prime is 81703213. The next prime is 81703253. The reversal of 81703243 is 34230718.

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 81703243 - 2²¹ = 79606091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81703213) 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, 76330 + ... + 77392.

It is an arithmetic number, because the mean of its divisors is an integer number (10337292).

Almost surely, 2^81703243 is an apocalyptic number.

81703243 is a deficient number, since it is larger than the sum of its proper divisors (995093).

81703243 is a wasteful number, since it uses less digits than its factorization.

81703243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1925.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 81703243 is about 9038.9846221796. The cubic root of 81703243 is about 433.9234275634.

The spelling of 81703243 in words is "eighty-one million, seven hundred three thousand, two hundred forty-three".