81235441 has 4 divisors (see below), whose sum is σ = 92840512. Its totient is φ = 69630372.

The previous prime is 81235439. The next prime is 81235447. The reversal of 81235441 is 14453218.

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 not a de Polignac number, because 81235441 - 2¹ = 81235439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81235447) 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, 5802525 + ... + 5802538.

It is an arithmetic number, because the mean of its divisors is an integer number (23210128).

Almost surely, 2^81235441 is an apocalyptic number.

It is an amenable number.

81235441 is a deficient number, since it is larger than the sum of its proper divisors (11605071).

81235441 is a wasteful number, since it uses less digits than its factorization.

81235441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11605070.

The product of its digits is 3840, while the sum is 28.

The square root of 81235441 is about 9013.0705644636. The cubic root of 81235441 is about 433.0936812274.

Adding to 81235441 its reverse (14453218), we get a palindrome (95688659).

The spelling of 81235441 in words is "eighty-one million, two hundred thirty-five thousand, four hundred forty-one".