81237 has 8 divisors (see below), whose sum is σ = 116704. Its totient is φ = 49968.

The previous prime is 81233. The next prime is 81239. The reversal of 81237 is 73218.

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

It is not a de Polignac number, because 81237 - 2² = 81233 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 81237.

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 7 ways as a sum of consecutive naturals, for example, 1003 + ... + 1080.

It is an arithmetic number, because the mean of its divisors is an integer number (14588).

2⁸¹²³⁷ is an apocalyptic number.

It is an amenable number.

81237 is a deficient number, since it is larger than the sum of its proper divisors (35467).

81237 is a wasteful number, since it uses less digits than its factorization.

81237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099.

The product of its digits is 336, while the sum is 21.

The square root of 81237 is about 285.0210518541. The cubic root of 81237 is about 43.3096451729.

The spelling of 81237 in words is "eighty-one thousand, two hundred thirty-seven".