81040337 has 8 divisors (see below), whose sum is σ = 94771776. Its totient is φ = 67847472.

The previous prime is 81040331. The next prime is 81040369. The reversal of 81040337 is 73304018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81040337 - 2⁴ = 81040321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81040331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134318 + ... + 134919.

It is an arithmetic number, because the mean of its divisors is an integer number (11846472).

Almost surely, 2^81040337 is an apocalyptic number.

It is an amenable number.

81040337 is a deficient number, since it is larger than the sum of its proper divisors (13731439).

81040337 is a wasteful number, since it uses less digits than its factorization.

81040337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269287.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 81040337 is about 9002.2406655232. The cubic root of 81040337 is about 432.7466814214.

The spelling of 81040337 in words is "eighty-one million, forty thousand, three hundred thirty-seven".