138148537 has 2 divisors, whose sum is σ = 138148538. Its totient is φ = 138148536.

The previous prime is 138148519. The next prime is 138148553. The reversal of 138148537 is 735841831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81432576 + 56715961 = 9024^2 + 7531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138148537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138148537.

It is not a weakly prime, because it can be changed into another prime (138148337) 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 as a sum of consecutive naturals, namely, 69074268 + 69074269.

It is an arithmetic number, because the mean of its divisors is an integer number (69074269).

Almost surely, 2^138148537 is an apocalyptic number.

It is an amenable number.

138148537 is a deficient number, since it is larger than the sum of its proper divisors (1).

138148537 is an equidigital number, since it uses as much as digits as its factorization.

138148537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 138148537 is about 11753.6605787304. The cubic root of 138148537 is about 516.9502662709.

The spelling of 138148537 in words is "one hundred thirty-eight million, one hundred forty-eight thousand, five hundred thirty-seven".