125116421 has 2 divisors, whose sum is σ = 125116422. Its totient is φ = 125116420.

The previous prime is 125116399. The next prime is 125116427. The reversal of 125116421 is 124611521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120143521 + 4972900 = 10961^2 + 2230^2 .

It is a cyclic number.

It is not a de Polignac number, because 125116421 - 2⁶ = 125116357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125116427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62558210 + 62558211.

It is an arithmetic number, because the mean of its divisors is an integer number (62558211).

Almost surely, 2^125116421 is an apocalyptic number.

It is an amenable number.

125116421 is a deficient number, since it is larger than the sum of its proper divisors (1).

125116421 is an equidigital number, since it uses as much as digits as its factorization.

125116421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 23.

The square root of 125116421 is about 11185.5451811702. The cubic root of 125116421 is about 500.1551798335.

Adding to 125116421 its reverse (124611521), we get a palindrome (249727942).

The spelling of 125116421 in words is "one hundred twenty-five million, one hundred sixteen thousand, four hundred twenty-one".