139632217 has 2 divisors, whose sum is σ = 139632218. Its totient is φ = 139632216.

The previous prime is 139632209. The next prime is 139632247. The reversal of 139632217 is 712236931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139499721 + 132496 = 11811^2 + 364^2 .

It is a cyclic number.

It is not a de Polignac number, because 139632217 - 2³ = 139632209 is a prime.

It is not a weakly prime, because it can be changed into another prime (139632247) 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, 69816108 + 69816109.

It is an arithmetic number, because the mean of its divisors is an integer number (69816109).

Almost surely, 2^139632217 is an apocalyptic number.

It is an amenable number.

139632217 is a deficient number, since it is larger than the sum of its proper divisors (1).

139632217 is an equidigital number, since it uses as much as digits as its factorization.

139632217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 34.

The square root of 139632217 is about 11816.6076773328. The cubic root of 139632217 is about 518.7943183310.

The spelling of 139632217 in words is "one hundred thirty-nine million, six hundred thirty-two thousand, two hundred seventeen".