125812217 has 2 divisors, whose sum is σ = 125812218. Its totient is φ = 125812216.

The previous prime is 125812207. The next prime is 125812241. The reversal of 125812217 is 712218521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68492176 + 57320041 = 8276^2 + 7571^2 .

It is a cyclic number.

It is not a de Polignac number, because 125812217 - 2⁶ = 125812153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125812217.

It is not a weakly prime, because it can be changed into another prime (125812207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62906108 + 62906109.

It is an arithmetic number, because the mean of its divisors is an integer number (62906109).

Almost surely, 2^125812217 is an apocalyptic number.

It is an amenable number.

125812217 is a deficient number, since it is larger than the sum of its proper divisors (1).

125812217 is an equidigital number, since it uses as much as digits as its factorization.

125812217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 29.

The square root of 125812217 is about 11216.6045218685. The cubic root of 125812217 is about 501.0806188433.

The spelling of 125812217 in words is "one hundred twenty-five million, eight hundred twelve thousand, two hundred seventeen".