625985189 has 2 divisors, whose sum is σ = 625985190. Its totient is φ = 625985188.

The previous prime is 625985183. The next prime is 625985287. The reversal of 625985189 is 981589526.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 315062500 + 310922689 = 17750^2 + 17633^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-625985189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 625985189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625985183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312992594 + 312992595.

It is an arithmetic number, because the mean of its divisors is an integer number (312992595).

Almost surely, 2^625985189 is an apocalyptic number.

It is an amenable number.

625985189 is a deficient number, since it is larger than the sum of its proper divisors (1).

625985189 is an equidigital number, since it uses as much as digits as its factorization.

625985189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 53.

The square root of 625985189 is about 25019.6960213349. The cubic root of 625985189 is about 855.4369773637.

The spelling of 625985189 in words is "six hundred twenty-five million, nine hundred eighty-five thousand, one hundred eighty-nine".