81125 has 16 divisors (see below), whose sum is σ = 112320. Its totient is φ = 58000.

The previous prime is 81119. The next prime is 81131. The reversal of 81125 is 52118.

It is an interprime number because it is at equal distance from previous prime (81119) and next prime (81131).

It is not a de Polignac number, because 81125 - 2¹² = 77029 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1346 + ... + 1404.

It is an arithmetic number, because the mean of its divisors is an integer number (7020).

2⁸¹¹²⁵ is an apocalyptic number.

It is an amenable number.

81125 is a deficient number, since it is larger than the sum of its proper divisors (31195).

81125 is a wasteful number, since it uses less digits than its factorization.

81125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 75 counting only the distinct ones).

The product of its digits is 80, while the sum is 17.

The square root of 81125 is about 284.8245073725. The cubic root of 81125 is about 43.2897326078.

The spelling of 81125 in words is "eighty-one thousand, one hundred twenty-five".