125190421 has 2 divisors, whose sum is σ = 125190422. Its totient is φ = 125190420.
The previous prime is 125190413. The next prime is 125190437. The reversal of 125190421 is 124091521.
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 114789796 + 10400625 = 10714^2 + 3225^2 .
It is a cyclic number.
It is not a de Polignac number, because 125190421 - 23 = 125190413 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (125190521) 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 as a sum of consecutive naturals, namely, 62595210 + 62595211.
It is an arithmetic number, because the mean of its divisors is an integer number (62595211).
Almost surely, 2125190421 is an apocalyptic number.
It is an amenable number.
125190421 is a deficient number, since it is larger than the sum of its proper divisors (1).
125190421 is an equidigital number, since it uses as much as digits as its factorization.
125190421 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 720, while the sum is 25.
The square root of 125190421 is about 11188.8525327667. The cubic root of 125190421 is about 500.2537658507.
The spelling of 125190421 in words is "one hundred twenty-five million, one hundred ninety thousand, four hundred twenty-one".
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