625355813 has 2 divisors, whose sum is σ = 625355814. Its totient is φ = 625355812.

The previous prime is 625355789. The next prime is 625355881. The reversal of 625355813 is 318553526.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 386436964 + 238918849 = 19658^2 + 15457^2 .

It is a cyclic number.

It is not a de Polignac number, because 625355813 - 2⁶ = 625355749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625355513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312677906 + 312677907.

It is an arithmetic number, because the mean of its divisors is an integer number (312677907).

Almost surely, 2^625355813 is an apocalyptic number.

It is an amenable number.

625355813 is a deficient number, since it is larger than the sum of its proper divisors (1).

625355813 is an equidigital number, since it uses as much as digits as its factorization.

625355813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108000, while the sum is 38.

The square root of 625355813 is about 25007.1152474651. The cubic root of 625355813 is about 855.1501910044.

The spelling of 625355813 in words is "six hundred twenty-five million, three hundred fifty-five thousand, eight hundred thirteen".