81053235 has 24 divisors (see below), whose sum is σ = 142191504. Its totient is φ = 42705600.

The previous prime is 81053233. The next prime is 81053257. The reversal of 81053235 is 53235018.

It is not a de Polignac number, because 81053235 - 2¹ = 81053233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81053199 and 81053208.

It is not an unprimeable number, because it can be changed into a prime (81053233) 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 23 ways as a sum of consecutive naturals, for example, 7116 + ... + 14585.

It is an arithmetic number, because the mean of its divisors is an integer number (5924646).

Almost surely, 2^81053235 is an apocalyptic number.

81053235 is a deficient number, since it is larger than the sum of its proper divisors (61138269).

81053235 is a wasteful number, since it uses less digits than its factorization.

81053235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21795 (or 21792 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 81053235 is about 9002.9570142259. The cubic root of 81053235 is about 432.7696381810.

It can be divided in two parts, 810 and 53235, that added together give a palindrome (54045).

The spelling of 81053235 in words is "eighty-one million, fifty-three thousand, two hundred thirty-five".