81263 has 16 divisors (see below), whose sum is σ = 107520. Its totient is φ = 59616.

The previous prime is 81239. The next prime is 81281. The reversal of 81263 is 36218.

It is a cyclic number.

It is not a de Polignac number, because 81263 - 2⁶ = 81199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81203) 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, 1706 + ... + 1752.

It is an arithmetic number, because the mean of its divisors is an integer number (6720).

2⁸¹²⁶³ is an apocalyptic number.

81263 is a deficient number, since it is larger than the sum of its proper divisors (26257).

81263 is a wasteful number, since it uses less digits than its factorization.

81263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86.

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

The square root of 81263 is about 285.0666588712. The cubic root of 81263 is about 43.3142651148.

The spelling of 81263 in words is "eighty-one thousand, two hundred sixty-three".