138501229 has 2 divisors, whose sum is σ = 138501230. Its totient is φ = 138501228.

The previous prime is 138501197. The next prime is 138501257. The reversal of 138501229 is 922105831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97515625 + 40985604 = 9875^2 + 6402^2 .

It is a cyclic number.

It is not a de Polignac number, because 138501229 - 2⁵ = 138501197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138501229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138501269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69250614 + 69250615.

It is an arithmetic number, because the mean of its divisors is an integer number (69250615).

Almost surely, 2^138501229 is an apocalyptic number.

It is an amenable number.

138501229 is a deficient number, since it is larger than the sum of its proper divisors (1).

138501229 is an equidigital number, since it uses as much as digits as its factorization.

138501229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 138501229 is about 11768.6545110306. The cubic root of 138501229 is about 517.3898155888.

The spelling of 138501229 in words is "one hundred thirty-eight million, five hundred one thousand, two hundred twenty-nine".