81703573 has 4 divisors (see below), whose sum is σ = 93375520. Its totient is φ = 70031628.

The previous prime is 81703561. The next prime is 81703577. The reversal of 81703573 is 37530718.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37530718 = 2 ⋅18765359.

It is a cyclic number.

It is not a de Polignac number, because 81703573 - 2⁵ = 81703541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81703577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5835963 + ... + 5835976.

It is an arithmetic number, because the mean of its divisors is an integer number (23343880).

Almost surely, 2^81703573 is an apocalyptic number.

It is an amenable number.

81703573 is a deficient number, since it is larger than the sum of its proper divisors (11671947).

81703573 is a wasteful number, since it uses less digits than its factorization.

81703573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11671946.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 81703573 is about 9039.0028764239. The cubic root of 81703573 is about 433.9240117692.

The spelling of 81703573 in words is "eighty-one million, seven hundred three thousand, five hundred seventy-three".