81174943 has 4 divisors (see below), whose sum is σ = 81362848. Its totient is φ = 80987040.

The previous prime is 81174941. The next prime is 81174953. The reversal of 81174943 is 34947118.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81174943 - 2¹ = 81174941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81174941) 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, 93303 + ... + 94168.

It is an arithmetic number, because the mean of its divisors is an integer number (20340712).

Almost surely, 2^81174943 is an apocalyptic number.

81174943 is a deficient number, since it is larger than the sum of its proper divisors (187905).

81174943 is a wasteful number, since it uses less digits than its factorization.

81174943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187904.

The product of its digits is 24192, while the sum is 37.

The square root of 81174943 is about 9009.7138134349. The cubic root of 81174943 is about 432.9861427436.

The spelling of 81174943 in words is "eighty-one million, one hundred seventy-four thousand, nine hundred forty-three".