139208161 has 8 divisors (see below), whose sum is σ = 144943848. Its totient is φ = 133584000.

The previous prime is 139208159. The next prime is 139208183. The reversal of 139208161 is 161802931.

It can be written as a sum of positive squares in 4 ways, for example, as 12780625 + 126427536 = 3575^2 + 11244^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139208161 - 2¹ = 139208159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139200161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25330 + ... + 30331.

It is an arithmetic number, because the mean of its divisors is an integer number (18117981).

Almost surely, 2^139208161 is an apocalyptic number.

It is an amenable number.

139208161 is a deficient number, since it is larger than the sum of its proper divisors (5735687).

139208161 is an equidigital number, since it uses as much as digits as its factorization.

139208161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55763.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 139208161 is about 11798.6508126989. The cubic root of 139208161 is about 518.2686017208.

The spelling of 139208161 in words is "one hundred thirty-nine million, two hundred eight thousand, one hundred sixty-one".