81713223 has 12 divisors (see below), whose sum is σ = 118213368. Its totient is φ = 54390960.

The previous prime is 81713189. The next prime is 81713249. The reversal of 81713223 is 32231718.

It is not a de Polignac number, because 81713223 - 2¹⁰ = 81712199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81753223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 613 + ... + 12798.

It is an arithmetic number, because the mean of its divisors is an integer number (9851114).

Almost surely, 2^81713223 is an apocalyptic number.

81713223 is a deficient number, since it is larger than the sum of its proper divisors (36500145).

81713223 is a wasteful number, since it uses less digits than its factorization.

81713223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14094 (or 14091 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 81713223 is about 9039.5366584798. The cubic root of 81713223 is about 433.9410946691.

The spelling of 81713223 in words is "eighty-one million, seven hundred thirteen thousand, two hundred twenty-three".