125188019 has 4 divisors (see below), whose sum is σ = 136568760. Its totient is φ = 113807280.

The previous prime is 125188009. The next prime is 125188031. The reversal of 125188019 is 910881521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 910881521 = 11 ⋅82807411.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125188019 is a prime.

It is a super-2 number, since 2×125188019² = 31344080202288722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125188019.

It is not an unprimeable number, because it can be changed into a prime (125188009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5690354 + ... + 5690375.

It is an arithmetic number, because the mean of its divisors is an integer number (34142190).

Almost surely, 2^125188019 is an apocalyptic number.

125188019 is a deficient number, since it is larger than the sum of its proper divisors (11380741).

125188019 is a wasteful number, since it uses less digits than its factorization.

125188019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11380740.

The product of its (nonzero) digits is 5760, while the sum is 35.

The square root of 125188019 is about 11188.7451932735. The cubic root of 125188019 is about 500.2505664120.

The spelling of 125188019 in words is "one hundred twenty-five million, one hundred eighty-eight thousand, nineteen".