125421029 has 2 divisors, whose sum is σ = 125421030. Its totient is φ = 125421028.

The previous prime is 125421011. The next prime is 125421031. The reversal of 125421029 is 920124521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89397025 + 36024004 = 9455^2 + 6002^2 .

It is a cyclic number.

It is not a de Polignac number, because 125421029 - 2¹² = 125416933 is a prime.

Together with 125421031, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 125420989 and 125421007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125421059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62710514 + 62710515.

It is an arithmetic number, because the mean of its divisors is an integer number (62710515).

Almost surely, 2^125421029 is an apocalyptic number.

It is an amenable number.

125421029 is a deficient number, since it is larger than the sum of its proper divisors (1).

125421029 is an equidigital number, since it uses as much as digits as its factorization.

125421029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 125421029 is about 11199.1530483336. The cubic root of 125421029 is about 500.5607428997.

The spelling of 125421029 in words is "one hundred twenty-five million, four hundred twenty-one thousand, twenty-nine".