125197421 has 2 divisors, whose sum is σ = 125197422. Its totient is φ = 125197420.

The previous prime is 125197361. The next prime is 125197459. The reversal of 125197421 is 124791521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117961321 + 7236100 = 10861^2 + 2690^2 .

It is a cyclic number.

It is not a de Polignac number, because 125197421 - 2⁶ = 125197357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125197481) 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, 62598710 + 62598711.

It is an arithmetic number, because the mean of its divisors is an integer number (62598711).

Almost surely, 2^125197421 is an apocalyptic number.

It is an amenable number.

125197421 is a deficient number, since it is larger than the sum of its proper divisors (1).

125197421 is an equidigital number, since it uses as much as digits as its factorization.

125197421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 32.

The square root of 125197421 is about 11189.1653397383. The cubic root of 125197421 is about 500.2630895435.

The spelling of 125197421 in words is "one hundred twenty-five million, one hundred ninety-seven thousand, four hundred twenty-one".