738638521 has 2 divisors, whose sum is σ = 738638522. Its totient is φ = 738638520.

The previous prime is 738638507. The next prime is 738638531. The reversal of 738638521 is 125836837.

738638521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 577729296 + 160909225 = 24036^2 + 12685^2 .

It is a cyclic number.

It is not a de Polignac number, because 738638521 - 2²³ = 730249913 is a prime.

It is not a weakly prime, because it can be changed into another prime (738638531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 369319260 + 369319261.

It is an arithmetic number, because the mean of its divisors is an integer number (369319261).

Almost surely, 2^738638521 is an apocalyptic number.

It is an amenable number.

738638521 is a deficient number, since it is larger than the sum of its proper divisors (1).

738638521 is an equidigital number, since it uses as much as digits as its factorization.

738638521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 43.

The square root of 738638521 is about 27177.9050149197. The cubic root of 738638521 is about 903.9491158511.

The spelling of 738638521 in words is "seven hundred thirty-eight million, six hundred thirty-eight thousand, five hundred twenty-one".