125842819 has 4 divisors (see below), whose sum is σ = 126023040. Its totient is φ = 125662600.

The previous prime is 125842793. The next prime is 125842831. The reversal of 125842819 is 918248521.

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

It is a cyclic number.

It is not a de Polignac number, because 125842819 - 2⁹ = 125842307 is a prime.

It is a super-2 number, since 2×125842819² = 31672830187733522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125842859) 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, 89059 + ... + 90460.

It is an arithmetic number, because the mean of its divisors is an integer number (31505760).

Almost surely, 2^125842819 is an apocalyptic number.

125842819 is a deficient number, since it is larger than the sum of its proper divisors (180221).

125842819 is an equidigital number, since it uses as much as digits as its factorization.

125842819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180220.

The product of its digits is 46080, while the sum is 40.

The square root of 125842819 is about 11217.9685772425. The cubic root of 125842819 is about 501.1212424181.

The spelling of 125842819 in words is "one hundred twenty-five million, eight hundred forty-two thousand, eight hundred nineteen".