81712349 has 4 divisors (see below), whose sum is σ = 81940320. Its totient is φ = 81484380.

The previous prime is 81712327. The next prime is 81712357. The reversal of 81712349 is 94321718.

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: 94321718 = 2 ⋅47160859.

It is a cyclic number.

It is not a de Polignac number, because 81712349 - 2¹⁶ = 81646813 is a prime.

It is a super-3 number, since 3×81712349³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81712049) 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 3 ways as a sum of consecutive naturals, for example, 113447 + ... + 114164.

It is an arithmetic number, because the mean of its divisors is an integer number (20485080).

Almost surely, 2^81712349 is an apocalyptic number.

It is an amenable number.

81712349 is a deficient number, since it is larger than the sum of its proper divisors (227971).

81712349 is a wasteful number, since it uses less digits than its factorization.

81712349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227970.

The product of its digits is 12096, while the sum is 35.

The square root of 81712349 is about 9039.4883151647. The cubic root of 81712349 is about 433.9395475271.

The spelling of 81712349 in words is "eighty-one million, seven hundred twelve thousand, three hundred forty-nine".