125831 has 4 divisors (see below), whose sum is σ = 130200. Its totient is φ = 121464.

The previous prime is 125821. The next prime is 125863. The reversal of 125831 is 138521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138521 = 71 ⋅1951.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125831 is a prime.

It is a super-2 number, since 2×125831² = 31666881122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125821) 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 3 ways as a sum of consecutive naturals, for example, 2141 + ... + 2198.

It is an arithmetic number, because the mean of its divisors is an integer number (32550).

2¹²⁵⁸³¹ is an apocalyptic number.

125831 is a deficient number, since it is larger than the sum of its proper divisors (4369).

125831 is an equidigital number, since it uses as much as digits as its factorization.

125831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4368.

The product of its digits is 240, while the sum is 20.

The square root of 125831 is about 354.7266553277. The cubic root of 125831 is about 50.1105553700.

The spelling of 125831 in words is "one hundred twenty-five thousand, eight hundred thirty-one".