125845 has 4 divisors (see below), whose sum is σ = 151020. Its totient is φ = 100672.

The previous prime is 125821. The next prime is 125863. The reversal of 125845 is 548521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37636 + 88209 = 194^2 + 297^2 .

It is a cyclic number.

It is not a de Polignac number, because 125845 - 2⁵ = 125813 is a prime.

125845 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12580 + ... + 12589.

It is an arithmetic number, because the mean of its divisors is an integer number (37755).

2¹²⁵⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

125845 is a deficient number, since it is larger than the sum of its proper divisors (25175).

125845 is an equidigital number, since it uses as much as digits as its factorization.

125845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25174.

The product of its digits is 1600, while the sum is 25.

The square root of 125845 is about 354.7463882832. The cubic root of 125845 is about 50.1124137403.

It can be divided in two parts, 125 and 845, that multiplied together give a square (105625 = 325²).

The spelling of 125845 in words is "one hundred twenty-five thousand, eight hundred forty-five".