125819 has 4 divisors (see below), whose sum is σ = 128544. Its totient is φ = 123096.

The previous prime is 125813. The next prime is 125821. The reversal of 125819 is 918521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 918521 = 47 ⋅19543.

It is a cyclic number.

It is not a de Polignac number, because 125819 - 2⁴ = 125803 is a prime.

It is a super-2 number, since 2×125819² = 31660841522, which contains 22 as substring.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1292 + ... + 1385.

It is an arithmetic number, because the mean of its divisors is an integer number (32136).

2¹²⁵⁸¹⁹ is an apocalyptic number.

125819 is a deficient number, since it is larger than the sum of its proper divisors (2725).

125819 is an equidigital number, since it uses as much as digits as its factorization.

125819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2724.

The product of its digits is 720, while the sum is 26.

The square root of 125819 is about 354.7097404921. The cubic root of 125819 is about 50.1089623715.

The spelling of 125819 in words is "one hundred twenty-five thousand, eight hundred nineteen".