81682541 has 4 divisors (see below), whose sum is σ = 82666752. Its totient is φ = 80698332.

The previous prime is 81682507. The next prime is 81682543. The reversal of 81682541 is 14528618.

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.

It is a cyclic number.

It is not a de Polignac number, because 81682541 - 2¹⁴ = 81666157 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 (81682543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491981 + ... + 492146.

It is an arithmetic number, because the mean of its divisors is an integer number (20666688).

Almost surely, 2^81682541 is an apocalyptic number.

It is an amenable number.

81682541 is a deficient number, since it is larger than the sum of its proper divisors (984211).

81682541 is an equidigital number, since it uses as much as digits as its factorization.

81682541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984210.

The product of its digits is 15360, while the sum is 35.

The square root of 81682541 is about 9037.8393988829. The cubic root of 81682541 is about 433.8867752377.

The spelling of 81682541 in words is "eighty-one million, six hundred eighty-two thousand, five hundred forty-one".