125415217 has 2 divisors, whose sum is σ = 125415218. Its totient is φ = 125415216.

The previous prime is 125415193. The next prime is 125415247. The reversal of 125415217 is 712514521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121022001 + 4393216 = 11001^2 + 2096^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125415217 is a prime.

It is not a weakly prime, because it can be changed into another prime (125415247) 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, 62707608 + 62707609.

It is an arithmetic number, because the mean of its divisors is an integer number (62707609).

Almost surely, 2^125415217 is an apocalyptic number.

It is an amenable number.

125415217 is a deficient number, since it is larger than the sum of its proper divisors (1).

125415217 is an equidigital number, since it uses as much as digits as its factorization.

125415217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2800, while the sum is 28.

The square root of 125415217 is about 11198.8935614194. The cubic root of 125415217 is about 500.5530107993.

Adding to 125415217 its reverse (712514521), we get a palindrome (837929738).

It can be divided in two parts, 1254 and 15217, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 125415217 in words is "one hundred twenty-five million, four hundred fifteen thousand, two hundred seventeen".