125221601 has 2 divisors, whose sum is σ = 125221602. Its totient is φ = 125221600.

The previous prime is 125221567. The next prime is 125221631. The reversal of 125221601 is 106122521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120978001 + 4243600 = 10999^2 + 2060^2 .

It is a cyclic number.

It is not a de Polignac number, because 125221601 - 2¹⁰ = 125220577 is a prime.

It is not a weakly prime, because it can be changed into another prime (125221631) 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, 62610800 + 62610801.

It is an arithmetic number, because the mean of its divisors is an integer number (62610801).

Almost surely, 2^125221601 is an apocalyptic number.

It is an amenable number.

125221601 is a deficient number, since it is larger than the sum of its proper divisors (1).

125221601 is an equidigital number, since it uses as much as digits as its factorization.

125221601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 125221601 is about 11190.2457971217. The cubic root of 125221601 is about 500.2952935691.

The spelling of 125221601 in words is "one hundred twenty-five million, two hundred twenty-one thousand, six hundred one".