81610441 has 4 divisors (see below), whose sum is σ = 89029584. Its totient is φ = 74191300.

The previous prime is 81610381. The next prime is 81610469. The reversal of 81610441 is 14401618.

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 81610441 - 2⁷ = 81610313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81610481) 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, 3709555 + ... + 3709576.

It is an arithmetic number, because the mean of its divisors is an integer number (22257396).

Almost surely, 2^81610441 is an apocalyptic number.

It is an amenable number.

81610441 is a deficient number, since it is larger than the sum of its proper divisors (7419143).

81610441 is a wasteful number, since it uses less digits than its factorization.

81610441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7419142.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 81610441 is about 9033.8497330872. The cubic root of 81610441 is about 433.7590757928.

The spelling of 81610441 in words is "eighty-one million, six hundred ten thousand, four hundred forty-one".