81562 has 8 divisors (see below), whose sum is σ = 131796. Its totient is φ = 37632.

The previous prime is 81559. The next prime is 81563. The reversal of 81562 is 26518.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 78961 + 2601 = 281^2 + 51^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81563) 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, 1543 + ... + 1594.

2⁸¹⁵⁶² is an apocalyptic number.

81562 is a deficient number, since it is larger than the sum of its proper divisors (50234).

81562 is a wasteful number, since it uses less digits than its factorization.

81562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3152.

The product of its digits is 480, while the sum is 22.

The square root of 81562 is about 285.5906160923. The cubic root of 81562 is about 43.3673237585.

The spelling of 81562 in words is "eighty-one thousand, five hundred sixty-two".