138776537 has 2 divisors, whose sum is σ = 138776538. Its totient is φ = 138776536.

The previous prime is 138776527. The next prime is 138776567. The reversal of 138776537 is 735677831.

It is a happy number.

138776537 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., 136983616 + 1792921 = 11704^2 + 1339^2 .

It is a cyclic number.

It is not a de Polignac number, because 138776537 - 2¹² = 138772441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138776491 and 138776500.

It is not a weakly prime, because it can be changed into another prime (138776507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69388268 + 69388269.

It is an arithmetic number, because the mean of its divisors is an integer number (69388269).

Almost surely, 2^138776537 is an apocalyptic number.

It is an amenable number.

138776537 is a deficient number, since it is larger than the sum of its proper divisors (1).

138776537 is an equidigital number, since it uses as much as digits as its factorization.

138776537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 740880, while the sum is 47.

The square root of 138776537 is about 11780.3453684516. The cubic root of 138776537 is about 517.7324052787.

The spelling of 138776537 in words is "one hundred thirty-eight million, seven hundred seventy-six thousand, five hundred thirty-seven".