125578217 has 2 divisors, whose sum is σ = 125578218. Its totient is φ = 125578216.

The previous prime is 125578169. The next prime is 125578231. The reversal of 125578217 is 712875521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111598096 + 13980121 = 10564^2 + 3739^2 .

It is a cyclic number.

It is not a de Polignac number, because 125578217 - 2⁸ = 125577961 is a prime.

It is not a weakly prime, because it can be changed into another prime (125578267) 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, 62789108 + 62789109.

It is an arithmetic number, because the mean of its divisors is an integer number (62789109).

Almost surely, 2^125578217 is an apocalyptic number.

It is an amenable number.

125578217 is a deficient number, since it is larger than the sum of its proper divisors (1).

125578217 is an equidigital number, since it uses as much as digits as its factorization.

125578217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39200, while the sum is 38.

The square root of 125578217 is about 11206.1687029957. The cubic root of 125578217 is about 500.7697702992.

The spelling of 125578217 in words is "one hundred twenty-five million, five hundred seventy-eight thousand, two hundred seventeen".