139339208465209 has 9 divisors (see below), whose sum is σ = 139434214383919. Its totient is φ = 139244267260480.

The previous prime is 139339208465183. The next prime is 139339208465227. The reversal of 139339208465209 is 902564802933931.

The square root of 139339208465209 is 11804203.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 77025109196025 + 62314099269184 = 8776395^2 + 7893928^2 .

It is not a de Polignac number, because 139339208465209 - 2³⁹ = 138789452651321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139339208465909) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 22793912937 + ... + 22793919049.

Almost surely, 2^{139339208465209} is an apocalyptic number.

139339208465209 is the 11804203-rd square number.

139339208465209 is the 5902102-nd centered octagonal number.

It is an amenable number.

139339208465209 is a deficient number, since it is larger than the sum of its proper divisors (95005918710).

139339208465209 is an frugal number, since it uses more digits than its factorization.

139339208465209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16088 (or 8044 counting only the distinct ones).

The product of its (nonzero) digits is 75582720, while the sum is 64.

The spelling of 139339208465209 in words is "one hundred thirty-nine trillion, three hundred thirty-nine billion, two hundred eight million, four hundred sixty-five thousand, two hundred nine".