638055043 has 2 divisors, whose sum is σ = 638055044. Its totient is φ = 638055042.

The previous prime is 638055037. The next prime is 638055049. The reversal of 638055043 is 340550836.

It is a balanced prime because it is at equal distance from previous prime (638055037) and next prime (638055049).

It is a cyclic number.

It is not a de Polignac number, because 638055043 - 2⁹ = 638054531 is a prime.

It is a super-2 number, since 2×638055043² = 814228475795463698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (638055049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319027521 + 319027522.

It is an arithmetic number, because the mean of its divisors is an integer number (319027522).

Almost surely, 2^638055043 is an apocalyptic number.

638055043 is a deficient number, since it is larger than the sum of its proper divisors (1).

638055043 is an equidigital number, since it uses as much as digits as its factorization.

638055043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 638055043 is about 25259.7514437494. The cubic root of 638055043 is about 860.9000146039.

The spelling of 638055043 in words is "six hundred thirty-eight million, fifty-five thousand, forty-three".