625458217 has 2 divisors, whose sum is σ = 625458218. Its totient is φ = 625458216.

The previous prime is 625458181. The next prime is 625458257. The reversal of 625458217 is 712854526.

625458217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (625458257) can be obtained adding 625458217 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 538054416 + 87403801 = 23196^2 + 9349^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-625458217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 625458217.

It is not a weakly prime, because it can be changed into another prime (625458257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312729108 + 312729109.

It is an arithmetic number, because the mean of its divisors is an integer number (312729109).

Almost surely, 2^625458217 is an apocalyptic number.

It is an amenable number.

625458217 is a deficient number, since it is larger than the sum of its proper divisors (1).

625458217 is an equidigital number, since it uses as much as digits as its factorization.

625458217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 134400, while the sum is 40.

The square root of 625458217 is about 25009.1626609129. The cubic root of 625458217 is about 855.1968663098.

The spelling of 625458217 in words is "six hundred twenty-five million, four hundred fifty-eight thousand, two hundred seventeen".