It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 101834521 = 587 ⋅173483.
It is a cyclic number.
It is an alternating number because its digits alternate between odd and even.
It is a Duffinian number.
It is a congruent number.
It is a 5442-hyperperfect number.
Almost surely, 2125438101 is an apocalyptic number.
It is an amenable number.
125438101 is an equidigital number, since it uses as much as digits as its factorization.
125438101 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 23050.
The square root of 125438101 is about 11199.9152228934. The cubic root of 125438101 is about 500.5834535657.
The spelling of 125438101 in words is "one hundred twenty-five million, four hundred thirty-eight thousand, one hundred one".