638025593 has 2 divisors, whose sum is σ = 638025594. Its totient is φ = 638025592.

The previous prime is 638025533. The next prime is 638025613. The reversal of 638025593 is 395520836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 453391849 + 184633744 = 21293^2 + 13588^2 .

It is a cyclic number.

It is not a de Polignac number, because 638025593 - 2¹² = 638021497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 638025593.

It is not a weakly prime, because it can be changed into another prime (638025503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319012796 + 319012797.

It is an arithmetic number, because the mean of its divisors is an integer number (319012797).

Almost surely, 2^638025593 is an apocalyptic number.

It is an amenable number.

638025593 is a deficient number, since it is larger than the sum of its proper divisors (1).

638025593 is an equidigital number, since it uses as much as digits as its factorization.

638025593 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 638025593 is about 25259.1684938361. The cubic root of 638025593 is about 860.8867691973.

The spelling of 638025593 in words is "six hundred thirty-eight million, twenty-five thousand, five hundred ninety-three".