81042285 has 8 divisors (see below), whose sum is σ = 129667680. Its totient is φ = 43222544.

The previous prime is 81042259. The next prime is 81042289. The reversal of 81042285 is 58224018.

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 81042285 - 2⁵ = 81042253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81042289) 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, 2701395 + ... + 2701424.

It is an arithmetic number, because the mean of its divisors is an integer number (16208460).

Almost surely, 2^81042285 is an apocalyptic number.

It is an amenable number.

81042285 is a deficient number, since it is larger than the sum of its proper divisors (48625395).

81042285 is a wasteful number, since it uses less digits than its factorization.

81042285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5402827.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 81042285 is about 9002.3488601587. The cubic root of 81042285 is about 432.7501487637.

The spelling of 81042285 in words is "eighty-one million, forty-two thousand, two hundred eighty-five".