138003541 has 6 divisors (see below), whose sum is σ = 149435970. Its totient is φ = 127387728.

The previous prime is 138003539. The next prime is 138003557. The reversal of 138003541 is 145300831.

It can be written as a sum of positive squares in 3 ways, for example, as 9090225 + 128913316 = 3015^2 + 11354^2 .

It is not a de Polignac number, because 138003541 - 2¹ = 138003539 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 (138003511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 408126 + ... + 408463.

It is an arithmetic number, because the mean of its divisors is an integer number (24905995).

Almost surely, 2^138003541 is an apocalyptic number.

It is an amenable number.

138003541 is a deficient number, since it is larger than the sum of its proper divisors (11432429).

138003541 is an equidigital number, since it uses as much as digits as its factorization.

138003541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816615 (or 816602 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 138003541 is about 11747.4908384727. The cubic root of 138003541 is about 516.7693451614.

The spelling of 138003541 in words is "one hundred thirty-eight million, three thousand, five hundred forty-one".