81255635 has 8 divisors (see below), whose sum is σ = 97774656. Its totient is φ = 64825920.

The previous prime is 81255583. The next prime is 81255637. The reversal of 81255635 is 53655218.

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

It is not a de Polignac number, because 81255635 - 2⁸ = 81255379 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81255595 and 81255604.

It is not an unprimeable number, because it can be changed into a prime (81255637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20306 + ... + 23975.

It is an arithmetic number, because the mean of its divisors is an integer number (12221832).

Almost surely, 2^81255635 is an apocalyptic number.

81255635 is a deficient number, since it is larger than the sum of its proper divisors (16519021).

81255635 is a wasteful number, since it uses less digits than its factorization.

81255635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44653.

The product of its digits is 36000, while the sum is 35.

The square root of 81255635 is about 9014.1907568012. The cubic root of 81255635 is about 433.1295652746.

The spelling of 81255635 in words is "eighty-one million, two hundred fifty-five thousand, six hundred thirty-five".