81701441 has 4 divisors (see below), whose sum is σ = 81782484. Its totient is φ = 81620400.

The previous prime is 81701437. The next prime is 81701447. The reversal of 81701441 is 14410718.

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 19228225 + 62473216 = 4385^2 + 7904^2 .

It is a cyclic number.

It is not a de Polignac number, because 81701441 - 2² = 81701437 is a prime.

It is a super-2 number, since 2×81701441² = 13350250922952962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81701441.

It is not an unprimeable number, because it can be changed into a prime (81701447) 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 3 ways as a sum of consecutive naturals, for example, 38990 + ... + 41031.

It is an arithmetic number, because the mean of its divisors is an integer number (20445621).

Almost surely, 2^81701441 is an apocalyptic number.

It is an amenable number.

81701441 is a deficient number, since it is larger than the sum of its proper divisors (81043).

81701441 is a wasteful number, since it uses less digits than its factorization.

81701441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81042.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 81701441 is about 9038.8849422924. The cubic root of 81701441 is about 433.9202374176.

The spelling of 81701441 in words is "eighty-one million, seven hundred one thousand, four hundred forty-one".