638352371 has 2 divisors, whose sum is σ = 638352372. Its totient is φ = 638352370.

The previous prime is 638352347. The next prime is 638352391. The reversal of 638352371 is 173253836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638352371 - 2¹⁸ = 638090227 is a prime.

It is a super-2 number, since 2×638352371² = 814987499122643282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (638352391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319176185 + 319176186.

It is an arithmetic number, because the mean of its divisors is an integer number (319176186).

Almost surely, 2^638352371 is an apocalyptic number.

638352371 is a deficient number, since it is larger than the sum of its proper divisors (1).

638352371 is an equidigital number, since it uses as much as digits as its factorization.

638352371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 38.

The square root of 638352371 is about 25265.6361685195. The cubic root of 638352371 is about 861.0337177657.

The spelling of 638352371 in words is "six hundred thirty-eight million, three hundred fifty-two thousand, three hundred seventy-one".