125500019 has 4 divisors (see below), whose sum is σ = 125723496. Its totient is φ = 125276544.

The previous prime is 125499989. The next prime is 125500061. The reversal of 125500019 is 910005521.

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 125500019 - 2²⁰ = 124451443 is a prime.

It is a super-2 number, since 2×125500019² = 31500509538000722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125499967 and 125500003.

It is not an unprimeable number, because it can be changed into a prime (125500099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110894 + ... + 112019.

It is an arithmetic number, because the mean of its divisors is an integer number (31430874).

Almost surely, 2^125500019 is an apocalyptic number.

125500019 is a deficient number, since it is larger than the sum of its proper divisors (223477).

125500019 is an equidigital number, since it uses as much as digits as its factorization.

125500019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223476.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 125500019 is about 11202.6790992155. The cubic root of 125500019 is about 500.6658050138.

The spelling of 125500019 in words is "one hundred twenty-five million, five hundred thousand, nineteen".