81235 has 16 divisors (see below), whose sum is σ = 122112. Its totient is φ = 50400.

The previous prime is 81233. The next prime is 81239. The reversal of 81235 is 53218.

81235 = 8² + 9² + ... + 62².

It is a happy number.

It is not a de Polignac number, because 81235 - 2¹ = 81233 is a prime.

It is a d-powerful number, because it can be written as 8² + 1 + 2¹⁶ + 3² + 5⁶ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81233) 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, 280 + ... + 490.

It is an arithmetic number, because the mean of its divisors is an integer number (7632).

2⁸¹²³⁵ is an apocalyptic number.

81235 is a deficient number, since it is larger than the sum of its proper divisors (40877).

81235 is a wasteful number, since it uses less digits than its factorization.

81235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234.

The product of its digits is 240, while the sum is 19.

The square root of 81235 is about 285.0175433197. The cubic root of 81235 is about 43.3092897519.

It can be divided in two parts, 8123 and 5, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 81235 in words is "eighty-one thousand, two hundred thirty-five".