138172273 has 2 divisors, whose sum is σ = 138172274. Its totient is φ = 138172272.

The previous prime is 138172271. The next prime is 138172357. The reversal of 138172273 is 372271831.

It is a happy number.

138172273 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., 95883264 + 42289009 = 9792^2 + 6503^2 .

It is a cyclic number.

It is not a de Polignac number, because 138172273 - 2¹ = 138172271 is a prime.

Together with 138172271, it forms a pair of twin primes.

It is equal to p_7814671 and since 138172273 and 7814671 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (138172271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69086136 + 69086137.

It is an arithmetic number, because the mean of its divisors is an integer number (69086137).

Almost surely, 2^138172273 is an apocalyptic number.

It is an amenable number.

138172273 is a deficient number, since it is larger than the sum of its proper divisors (1).

138172273 is an equidigital number, since it uses as much as digits as its factorization.

138172273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 34.

The square root of 138172273 is about 11754.6702633464. The cubic root of 138172273 is about 516.9798711901.

The spelling of 138172273 in words is "one hundred thirty-eight million, one hundred seventy-two thousand, two hundred seventy-three".