125531 has 8 divisors (see below), whose sum is σ = 145920. Its totient is φ = 105768.

The previous prime is 125527. The next prime is 125539. The reversal of 125531 is 135521.

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

It is a cyclic number.

It is not a de Polignac number, because 125531 - 2² = 125527 is a prime.

It is a super-2 number, since 2×125531² = 31516063922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125539) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 440 + ... + 666.

It is an arithmetic number, because the mean of its divisors is an integer number (18240).

2¹²⁵⁵³¹ is an apocalyptic number.

125531 is a deficient number, since it is larger than the sum of its proper divisors (20389).

125531 is an equidigital number, since it uses as much as digits as its factorization.

125531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313.

The product of its digits is 150, while the sum is 17.

The square root of 125531 is about 354.3035421782. The cubic root of 125531 is about 50.0706999831.

It can be divided in two parts, 125 and 531, that added together give a palindrome (656).

The spelling of 125531 in words is "one hundred twenty-five thousand, five hundred thirty-one".