2038643521 has 2 divisors, whose sum is σ = 2038643522. Its totient is φ = 2038643520.

The previous prime is 2038643491. The next prime is 2038643527. The reversal of 2038643521 is 1253468302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1777465600 + 261177921 = 42160^2 + 16161^2 .

It is a cyclic number.

It is not a de Polignac number, because 2038643521 - 2⁷ = 2038643393 is a prime.

It is not a weakly prime, because it can be changed into another prime (2038643527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1019321760 + 1019321761.

It is an arithmetic number, because the mean of its divisors is an integer number (1019321761).

Almost surely, 2^2038643521 is an apocalyptic number.

It is an amenable number.

2038643521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2038643521 is an equidigital number, since it uses as much as digits as its factorization.

2038643521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 2038643521 is about 45151.3401905193. The cubic root of 2038643521 is about 1267.9839717164.

The spelling of 2038643521 in words is "two billion, thirty-eight million, six hundred forty-three thousand, five hundred twenty-one".