81717383 has 8 divisors (see below), whose sum is σ = 90030096. Its totient is φ = 73552000.

The previous prime is 81717371. The next prime is 81717431. The reversal of 81717383 is 38371718.

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 81717383 - 2⁶ = 81717319 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 (81717323) 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, 35666 + ... + 37887.

It is an arithmetic number, because the mean of its divisors is an integer number (11253762).

Almost surely, 2^81717383 is an apocalyptic number.

81717383 is a deficient number, since it is larger than the sum of its proper divisors (8312713).

81717383 is a wasteful number, since it uses less digits than its factorization.

81717383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73665.

The product of its digits is 28224, while the sum is 38.

The square root of 81717383 is about 9039.7667558406. The cubic root of 81717383 is about 433.9484584888.

The spelling of 81717383 in words is "eighty-one million, seven hundred seventeen thousand, three hundred eighty-three".