138690547 has 2 divisors, whose sum is σ = 138690548. Its totient is φ = 138690546.

The previous prime is 138690527. The next prime is 138690551. The reversal of 138690547 is 745096831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138690547 is a prime.

It is not a weakly prime, because it can be changed into another prime (138690527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69345273 + 69345274.

It is an arithmetic number, because the mean of its divisors is an integer number (69345274).

Almost surely, 2^138690547 is an apocalyptic number.

138690547 is a deficient number, since it is larger than the sum of its proper divisors (1).

138690547 is an equidigital number, since it uses as much as digits as its factorization.

138690547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 138690547 is about 11776.6950796902. The cubic root of 138690547 is about 517.6254491392.

The spelling of 138690547 in words is "one hundred thirty-eight million, six hundred ninety thousand, five hundred forty-seven".