138057217 has 2 divisors, whose sum is σ = 138057218. Its totient is φ = 138057216.

The previous prime is 138057181. The next prime is 138057223. The reversal of 138057217 is 712750831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115863696 + 22193521 = 10764^2 + 4711^2 .

It is a cyclic number.

It is not a de Polignac number, because 138057217 - 2¹⁹ = 137532929 is a prime.

It is not a weakly prime, because it can be changed into another prime (138057277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69028608 + 69028609.

It is an arithmetic number, because the mean of its divisors is an integer number (69028609).

Almost surely, 2^138057217 is an apocalyptic number.

It is an amenable number.

138057217 is a deficient number, since it is larger than the sum of its proper divisors (1).

138057217 is an equidigital number, since it uses as much as digits as its factorization.

138057217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 34.

The square root of 138057217 is about 11749.7751893387. The cubic root of 138057217 is about 516.8363350268.

The spelling of 138057217 in words is "one hundred thirty-eight million, fifty-seven thousand, two hundred seventeen".