81040359 has 8 divisors (see below), whose sum is σ = 108506880. Its totient is φ = 53800376.

The previous prime is 81040331. The next prime is 81040369. The reversal of 81040359 is 95304018.

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

It is a cyclic number.

It is not a de Polignac number, because 81040359 - 2¹¹ = 81038311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81040369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55797 + ... + 57230.

It is an arithmetic number, because the mean of its divisors is an integer number (13563360).

Almost surely, 2^81040359 is an apocalyptic number.

81040359 is a deficient number, since it is larger than the sum of its proper divisors (27466521).

81040359 is a wasteful number, since it uses less digits than its factorization.

81040359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113269.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 81040359 is about 9002.2418874412. The cubic root of 81040359 is about 432.7467205806.

The spelling of 81040359 in words is "eighty-one million, forty thousand, three hundred fifty-nine".