625694389 has 2 divisors, whose sum is σ = 625694390. Its totient is φ = 625694388.

The previous prime is 625694371. The next prime is 625694413. The reversal of 625694389 is 983496526.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 622103364 + 3591025 = 24942^2 + 1895^2 .

It is a cyclic number.

It is not a de Polignac number, because 625694389 - 2⁵ = 625694357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625694189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312847194 + 312847195.

It is an arithmetic number, because the mean of its divisors is an integer number (312847195).

Almost surely, 2^625694389 is an apocalyptic number.

It is an amenable number.

625694389 is a deficient number, since it is larger than the sum of its proper divisors (1).

625694389 is an equidigital number, since it uses as much as digits as its factorization.

625694389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 52.

The square root of 625694389 is about 25013.8839247327. The cubic root of 625694389 is about 855.3044930771.

The spelling of 625694389 in words is "six hundred twenty-five million, six hundred ninety-four thousand, three hundred eighty-nine".