125811 has 12 divisors (see below), whose sum is σ = 207792. Its totient is φ = 71856.

The previous prime is 125803. The next prime is 125813. The reversal of 125811 is 118521.

125811 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 125811 - 2³ = 125803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 936 + ... + 1061.

It is an arithmetic number, because the mean of its divisors is an integer number (17316).

2¹²⁵⁸¹¹ is an apocalyptic number.

125811 is a deficient number, since it is larger than the sum of its proper divisors (81981).

125811 is a wasteful number, since it uses less digits than its factorization.

125811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010 (or 2007 counting only the distinct ones).

The product of its digits is 80, while the sum is 18.

The square root of 125811 is about 354.6984634869. The cubic root of 125811 is about 50.1079003163.

The spelling of 125811 in words is "one hundred twenty-five thousand, eight hundred eleven".