81872341 has 8 divisors (see below), whose sum is σ = 85883904. Its totient is φ = 77898480.

The previous prime is 81872339. The next prime is 81872359. The reversal of 81872341 is 14327818.

It is a happy number.

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 81872341 - 2¹ = 81872339 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81872297 and 81872306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81872321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4926 + ... + 13711.

It is an arithmetic number, because the mean of its divisors is an integer number (10735488).

Almost surely, 2^81872341 is an apocalyptic number.

It is an amenable number.

81872341 is a deficient number, since it is larger than the sum of its proper divisors (4011563).

81872341 is a wasteful number, since it uses less digits than its factorization.

81872341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18851.

The product of its digits is 10752, while the sum is 34.

The square root of 81872341 is about 9048.3336034874. Note that the first 3 decimals coincide. The cubic root of 81872341 is about 434.2225793813. Note that the first 3 decimals are identical.

The spelling of 81872341 in words is "eighty-one million, eight hundred seventy-two thousand, three hundred forty-one".