125220217 has 4 divisors (see below), whose sum is σ = 126017956. Its totient is φ = 124422480.

The previous prime is 125220197. The next prime is 125220229. The reversal of 125220217 is 712022521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712022521 = 7 ⋅101717503.

It can be written as a sum of positive squares in 2 ways, for example, as 14107536 + 111112681 = 3756^2 + 10541^2 .

It is a cyclic number.

It is not a de Polignac number, because 125220217 - 2¹¹ = 125218169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125220817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398634 + ... + 398947.

It is an arithmetic number, because the mean of its divisors is an integer number (31504489).

Almost surely, 2^125220217 is an apocalyptic number.

It is an amenable number.

125220217 is a deficient number, since it is larger than the sum of its proper divisors (797739).

125220217 is an equidigital number, since it uses as much as digits as its factorization.

125220217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797738.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 125220217 is about 11190.1839573798. The cubic root of 125220217 is about 500.2934504067.

Adding to 125220217 its reverse (712022521), we get a palindrome (837242738).

The spelling of 125220217 in words is "one hundred twenty-five million, two hundred twenty thousand, two hundred seventeen".