138502547 has 2 divisors, whose sum is σ = 138502548. Its totient is φ = 138502546.

The previous prime is 138502543. The next prime is 138502667. The reversal of 138502547 is 745205831.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (745205831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138502547 - 2² = 138502543 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138502543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69251273 + 69251274.

It is an arithmetic number, because the mean of its divisors is an integer number (69251274).

Almost surely, 2^138502547 is an apocalyptic number.

138502547 is a deficient number, since it is larger than the sum of its proper divisors (1).

138502547 is an equidigital number, since it uses as much as digits as its factorization.

138502547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 138502547 is about 11768.7105071031. The cubic root of 138502547 is about 517.3914567718.

The spelling of 138502547 in words is "one hundred thirty-eight million, five hundred two thousand, five hundred forty-seven".