81040371 has 4 divisors (see below), whose sum is σ = 108053832. Its totient is φ = 54026912.

The previous prime is 81040369. The next prime is 81040373. The reversal of 81040371 is 17304018.

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

It is an interprime number because it is at equal distance from previous prime (81040369) and next prime (81040373).

It is a cyclic number.

It is not a de Polignac number, because 81040371 - 2¹ = 81040369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81040373) 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, 13506726 + ... + 13506731.

It is an arithmetic number, because the mean of its divisors is an integer number (27013458).

Almost surely, 2^81040371 is an apocalyptic number.

81040371 is a deficient number, since it is larger than the sum of its proper divisors (27013461).

81040371 is a wasteful number, since it uses less digits than its factorization.

81040371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27013460.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 81040371 is about 9002.2425539418. The cubic root of 81040371 is about 432.7467419401.

Adding to 81040371 its reverse (17304018), we get a palindrome (98344389).

The spelling of 81040371 in words is "eighty-one million, forty thousand, three hundred seventy-one".