139632209 has 2 divisors, whose sum is σ = 139632210. Its totient is φ = 139632208.

The previous prime is 139632193. The next prime is 139632217. The reversal of 139632209 is 902236931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104857600 + 34774609 = 10240^2 + 5897^2 .

It is a cyclic number.

It is not a de Polignac number, because 139632209 - 2⁴ = 139632193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139632289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69816104 + 69816105.

It is an arithmetic number, because the mean of its divisors is an integer number (69816105).

Almost surely, 2^139632209 is an apocalyptic number.

It is an amenable number.

139632209 is a deficient number, since it is larger than the sum of its proper divisors (1).

139632209 is an equidigital number, since it uses as much as digits as its factorization.

139632209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 139632209 is about 11816.6073388261. The cubic root of 139632209 is about 518.7943084232.

The spelling of 139632209 in words is "one hundred thirty-nine million, six hundred thirty-two thousand, two hundred nine".