138003557 has 2 divisors, whose sum is σ = 138003558. Its totient is φ = 138003556.

The previous prime is 138003539. The next prime is 138003559. The reversal of 138003557 is 755300831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75498721 + 62504836 = 8689^2 + 7906^2 .

It is a cyclic number.

It is not a de Polignac number, because 138003557 - 2¹⁰ = 138002533 is a prime.

Together with 138003559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138003559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69001778 + 69001779.

It is an arithmetic number, because the mean of its divisors is an integer number (69001779).

Almost surely, 2^138003557 is an apocalyptic number.

It is an amenable number.

138003557 is a deficient number, since it is larger than the sum of its proper divisors (1).

138003557 is an equidigital number, since it uses as much as digits as its factorization.

138003557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 138003557 is about 11747.4915194692. The cubic root of 138003557 is about 516.7693651326.

The spelling of 138003557 in words is "one hundred thirty-eight million, three thousand, five hundred fifty-seven".