81719343 has 12 divisors (see below), whose sum is σ = 118640808. Its totient is φ = 54201840.

The previous prime is 81719327. The next prime is 81719353. The reversal of 81719343 is 34391718.

It is a happy number.

It is not a de Polignac number, because 81719343 - 2⁴ = 81719327 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81719298 and 81719307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81719353) 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, 21273 + ... + 24818.

It is an arithmetic number, because the mean of its divisors is an integer number (9886734).

Almost surely, 2^81719343 is an apocalyptic number.

81719343 is a deficient number, since it is larger than the sum of its proper divisors (36921465).

81719343 is a wasteful number, since it uses less digits than its factorization.

81719343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46294 (or 46291 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 81719343 is about 9039.8751650673. The cubic root of 81719343 is about 433.9519278941.

The spelling of 81719343 in words is "eighty-one million, seven hundred nineteen thousand, three hundred forty-three".