138932537 has 2 divisors, whose sum is σ = 138932538. Its totient is φ = 138932536.

The previous prime is 138932501. The next prime is 138932593. The reversal of 138932537 is 735239831.

138932537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125529616 + 13402921 = 11204^2 + 3661^2 .

It is a cyclic number.

It is not a de Polignac number, because 138932537 - 2²⁰ = 137883961 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 138932494 and 138932503.

It is not a weakly prime, because it can be changed into another prime (138932137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69466268 + 69466269.

It is an arithmetic number, because the mean of its divisors is an integer number (69466269).

Almost surely, 2^138932537 is an apocalyptic number.

It is an amenable number.

138932537 is a deficient number, since it is larger than the sum of its proper divisors (1).

138932537 is an equidigital number, since it uses as much as digits as its factorization.

138932537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 41.

The square root of 138932537 is about 11786.9647068276. The cubic root of 138932537 is about 517.9263285755.

The spelling of 138932537 in words is "one hundred thirty-eight million, nine hundred thirty-two thousand, five hundred thirty-seven".