81032961 has 4 divisors (see below), whose sum is σ = 108043952. Its totient is φ = 54021972.

The previous prime is 81032953. The next prime is 81032981. The reversal of 81032961 is 16923018.

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 81032961 - 2³ = 81032953 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81032911) 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, 13505491 + ... + 13505496.

It is an arithmetic number, because the mean of its divisors is an integer number (27010988).

Almost surely, 2^81032961 is an apocalyptic number.

It is an amenable number.

81032961 is a deficient number, since it is larger than the sum of its proper divisors (27010991).

81032961 is a wasteful number, since it uses less digits than its factorization.

81032961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27010990.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 81032961 is about 9001.8309804173. The cubic root of 81032961 is about 432.7335520075.

Adding to 81032961 its reverse (16923018), we get a palindrome (97955979).

The spelling of 81032961 in words is "eighty-one million, thirty-two thousand, nine hundred sixty-one".