1538522989 has 4 divisors (see below), whose sum is σ = 1545241660. Its totient is φ = 1531804320.

The previous prime is 1538522983. The next prime is 1538523013. The reversal of 1538522989 is 9892258351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9892258351 = 211 ⋅46882741.

It can be written as a sum of positive squares in 2 ways, for example, as 1158857764 + 379665225 = 34042^2 + 19485^2 .

It is a cyclic number.

It is not a de Polignac number, because 1538522989 - 2¹⁷ = 1538391917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538522983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3358992 + ... + 3359449.

It is an arithmetic number, because the mean of its divisors is an integer number (386310415).

Almost surely, 2^1538522989 is an apocalyptic number.

It is an amenable number.

1538522989 is a deficient number, since it is larger than the sum of its proper divisors (6718671).

1538522989 is an equidigital number, since it uses as much as digits as its factorization.

1538522989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6718670.

The product of its digits is 1555200, while the sum is 52.

The square root of 1538522989 is about 39224.0103635516. The cubic root of 1538522989 is about 1154.4310432770.

The spelling of 1538522989 in words is "one billion, five hundred thirty-eight million, five hundred twenty-two thousand, nine hundred eighty-nine".