81795541 has 4 divisors (see below), whose sum is σ = 82638892. Its totient is φ = 80952192.

The previous prime is 81795509. The next prime is 81795601. The reversal of 81795541 is 14559718.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66748900 + 15046641 = 8170^2 + 3879^2 .

It is a cyclic number.

It is not a de Polignac number, because 81795541 - 2⁵ = 81795509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81795494 and 81795503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81715541) 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, 421530 + ... + 421723.

It is an arithmetic number, because the mean of its divisors is an integer number (20659723).

Almost surely, 2^81795541 is an apocalyptic number.

It is an amenable number.

81795541 is a deficient number, since it is larger than the sum of its proper divisors (843351).

81795541 is an equidigital number, since it uses as much as digits as its factorization.

81795541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843350.

The product of its digits is 50400, while the sum is 40.

The square root of 81795541 is about 9044.0887324263. The cubic root of 81795541 is about 434.0867633595.

The spelling of 81795541 in words is "eighty-one million, seven hundred ninety-five thousand, five hundred forty-one".