625121217 has 12 divisors (see below), whose sum is σ = 1031946240. Its totient is φ = 357212088.

The previous prime is 625121207. The next prime is 625121221. The reversal of 625121217 is 712121526.

625121217 is a `hidden beast` number, since 625 + 1 + 21 + 2 + 17 = 666.

It is not a de Polignac number, because 625121217 - 2⁴ = 625121201 is a prime.

It is a super-2 number, since 2×625121217² = 781553071887122178, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (625121207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4961217 + ... + 4961342.

It is an arithmetic number, because the mean of its divisors is an integer number (85995520).

Almost surely, 2^625121217 is an apocalyptic number.

It is an amenable number.

625121217 is a deficient number, since it is larger than the sum of its proper divisors (406825023).

625121217 is a wasteful number, since it uses less digits than its factorization.

625121217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9922572 (or 9922569 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 625121217 is about 25002.4242224629. The cubic root of 625121217 is about 855.0432439398.

The spelling of 625121217 in words is "six hundred twenty-five million, one hundred twenty-one thousand, two hundred seventeen".