638260153 has 2 divisors, whose sum is σ = 638260154. Its totient is φ = 638260152.

The previous prime is 638260127. The next prime is 638260169. The reversal of 638260153 is 351062836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 622602304 + 15657849 = 24952^2 + 3957^2 .

It is a cyclic number.

It is not a de Polignac number, because 638260153 - 2²⁵ = 604705721 is a prime.

It is not a weakly prime, because it can be changed into another prime (638260253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319130076 + 319130077.

It is an arithmetic number, because the mean of its divisors is an integer number (319130077).

Almost surely, 2^638260153 is an apocalyptic number.

It is an amenable number.

638260153 is a deficient number, since it is larger than the sum of its proper divisors (1).

638260153 is an equidigital number, since it uses as much as digits as its factorization.

638260153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 638260153 is about 25263.8111337146. The cubic root of 638260153 is about 860.9922533985.

The spelling of 638260153 in words is "six hundred thirty-eight million, two hundred sixty thousand, one hundred fifty-three".