1538538541 has 4 divisors (see below), whose sum is σ = 1538646784. Its totient is φ = 1538430300.

The previous prime is 1538538503. The next prime is 1538538559. The reversal of 1538538541 is 1458358351.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1538538541 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 (1538530541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28875 + ... + 62536.

It is an arithmetic number, because the mean of its divisors is an integer number (384661696).

Almost surely, 2^1538538541 is an apocalyptic number.

It is an amenable number.

1538538541 is a deficient number, since it is larger than the sum of its proper divisors (108243).

1538538541 is an equidigital number, since it uses as much as digits as its factorization.

1538538541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108242.

The product of its digits is 288000, while the sum is 43.

The square root of 1538538541 is about 39224.2086089700. The cubic root of 1538538541 is about 1154.4349330794.

The spelling of 1538538541 in words is "one billion, five hundred thirty-eight million, five hundred thirty-eight thousand, five hundred forty-one".