81408941 has 4 divisors (see below), whose sum is σ = 81461952. Its totient is φ = 81355932.

The previous prime is 81408911. The next prime is 81408949. The reversal of 81408941 is 14980418.

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, and also an emirpimes, since its reverse is a distinct semiprime: 14980418 = 2 ⋅7490209.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81408941 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81408949) 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, 24131 + ... + 27296.

It is an arithmetic number, because the mean of its divisors is an integer number (20365488).

Almost surely, 2^81408941 is an apocalyptic number.

It is an amenable number.

81408941 is a deficient number, since it is larger than the sum of its proper divisors (53011).

81408941 is a wasteful number, since it uses less digits than its factorization.

81408941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53010.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 81408941 is about 9022.6903415777. The cubic root of 81408941 is about 433.4017910912.

The spelling of 81408941 in words is "eighty-one million, four hundred eight thousand, nine hundred forty-one".