81040335 has 16 divisors (see below), whose sum is σ = 131863680. Its totient is φ = 42488480.

The previous prime is 81040331. The next prime is 81040369. The reversal of 81040335 is 53304018.

It is not a de Polignac number, because 81040335 - 2² = 81040331 is a prime.

It is a congruent number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44901 + ... + 46670.

It is an arithmetic number, because the mean of its divisors is an integer number (8241480).

Almost surely, 2^81040335 is an apocalyptic number.

81040335 is a deficient number, since it is larger than the sum of its proper divisors (50823345).

81040335 is a wasteful number, since it uses less digits than its factorization.

81040335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91638.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 81040335 is about 9002.2405544398. The cubic root of 81040335 is about 432.7466778614.

The spelling of 81040335 in words is "eighty-one million, forty thousand, three hundred thirty-five".