625878389 has 2 divisors, whose sum is σ = 625878390. Its totient is φ = 625878388.

The previous prime is 625878359. The next prime is 625878391. The reversal of 625878389 is 983878526.

625878389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 625750225 + 128164 = 25015^2 + 358^2 .

It is a cyclic number.

It is not a de Polignac number, because 625878389 - 2⁸ = 625878133 is a prime.

Together with 625878391, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625878359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312939194 + 312939195.

It is an arithmetic number, because the mean of its divisors is an integer number (312939195).

Almost surely, 2^625878389 is an apocalyptic number.

It is an amenable number.

625878389 is a deficient number, since it is larger than the sum of its proper divisors (1).

625878389 is an equidigital number, since it uses as much as digits as its factorization.

625878389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5806080, while the sum is 56.

The square root of 625878389 is about 25017.5616117958. The cubic root of 625878389 is about 855.3883255920.

The spelling of 625878389 in words is "six hundred twenty-five million, eight hundred seventy-eight thousand, three hundred eighty-nine".