139002173 has 2 divisors, whose sum is σ = 139002174. Its totient is φ = 139002172.

The previous prime is 139002169. The next prime is 139002181. The reversal of 139002173 is 371200931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133702969 + 5299204 = 11563^2 + 2302^2 .

It is an emirp because it is prime and its reverse (371200931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139002173 - 2² = 139002169 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139002973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69501086 + 69501087.

It is an arithmetic number, because the mean of its divisors is an integer number (69501087).

Almost surely, 2^139002173 is an apocalyptic number.

It is an amenable number.

139002173 is a deficient number, since it is larger than the sum of its proper divisors (1).

139002173 is an equidigital number, since it uses as much as digits as its factorization.

139002173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 139002173 is about 11789.9182779186. The cubic root of 139002173 is about 518.0128460910.

The spelling of 139002173 in words is "one hundred thirty-nine million, two thousand, one hundred seventy-three".