638901301 has 2 divisors, whose sum is σ = 638901302. Its totient is φ = 638901300.

The previous prime is 638901287. The next prime is 638901317. The reversal of 638901301 is 103109836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 613751076 + 25150225 = 24774^2 + 5015^2 .

It is a cyclic number.

It is not a de Polignac number, because 638901301 - 2⁵ = 638901269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638908301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319450650 + 319450651.

It is an arithmetic number, because the mean of its divisors is an integer number (319450651).

Almost surely, 2^638901301 is an apocalyptic number.

It is an amenable number.

638901301 is a deficient number, since it is larger than the sum of its proper divisors (1).

638901301 is an equidigital number, since it uses as much as digits as its factorization.

638901301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 638901301 is about 25276.4970080903. The cubic root of 638901301 is about 861.2804528741.

The spelling of 638901301 in words is "six hundred thirty-eight million, nine hundred one thousand, three hundred one".