139120217 has 2 divisors, whose sum is σ = 139120218. Its totient is φ = 139120216.

The previous prime is 139120193. The next prime is 139120229. The reversal of 139120217 is 712021931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133379401 + 5740816 = 11549^2 + 2396^2 .

It is a cyclic number.

It is not a de Polignac number, because 139120217 - 2²⁶ = 72011353 is a prime.

It is not a weakly prime, because it can be changed into another prime (139120277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69560108 + 69560109.

It is an arithmetic number, because the mean of its divisors is an integer number (69560109).

Almost surely, 2^139120217 is an apocalyptic number.

It is an amenable number.

139120217 is a deficient number, since it is larger than the sum of its proper divisors (1).

139120217 is an equidigital number, since it uses as much as digits as its factorization.

139120217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 139120217 is about 11794.9233571058. The cubic root of 139120217 is about 518.1594409384.

The spelling of 139120217 in words is "one hundred thirty-nine million, one hundred twenty thousand, two hundred seventeen".