81236 has 12 divisors (see below), whose sum is σ = 148512. Its totient is φ = 38808.

The previous prime is 81233. The next prime is 81239. The reversal of 81236 is 63218.

It is an interprime number because it is at equal distance from previous prime (81233) and next prime (81239).

It is an alternating number because its digits alternate between even and odd.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 350 + ... + 533.

It is an arithmetic number, because the mean of its divisors is an integer number (12376).

2⁸¹²³⁶ is an apocalyptic number.

It is an amenable number.

81236 is a deficient number, since it is larger than the sum of its proper divisors (67276).

81236 is a wasteful number, since it uses less digits than its factorization.

81236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910 (or 908 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The square root of 81236 is about 285.0192975923. The cubic root of 81236 is about 43.3094674631.

It can be divided in two parts, 812 and 36, that added together give a palindrome (848).

The spelling of 81236 in words is "eighty-one thousand, two hundred thirty-six".