125400217 has 4 divisors (see below), whose sum is σ = 125427636. Its totient is φ = 125372800.

The previous prime is 125400179. The next prime is 125400221. The reversal of 125400217 is 712004521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81522841 + 43877376 = 9029^2 + 6624^2 .

It is a cyclic number.

It is not a de Polignac number, because 125400217 - 2¹⁹ = 124875929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125400227) 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, 5008 + ... + 16609.

It is an arithmetic number, because the mean of its divisors is an integer number (31356909).

Almost surely, 2^125400217 is an apocalyptic number.

It is an amenable number.

125400217 is a deficient number, since it is larger than the sum of its proper divisors (27419).

125400217 is an equidigital number, since it uses as much as digits as its factorization.

125400217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27418.

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

The square root of 125400217 is about 11198.2238323763. The cubic root of 125400217 is about 500.5330541712.

Adding to 125400217 its reverse (712004521), we get a palindrome (837404738).

The spelling of 125400217 in words is "one hundred twenty-five million, four hundred thousand, two hundred seventeen".