139087171 has 2 divisors, whose sum is σ = 139087172. Its totient is φ = 139087170.

The previous prime is 139087139. The next prime is 139087229. The reversal of 139087171 is 171780931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139087171 - 2⁵ = 139087139 is a prime.

It is a super-2 number, since 2×139087171² = 38690482273566482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 139087171.

It is not a weakly prime, because it can be changed into another prime (139082171) 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 as a sum of consecutive naturals, namely, 69543585 + 69543586.

It is an arithmetic number, because the mean of its divisors is an integer number (69543586).

Almost surely, 2^139087171 is an apocalyptic number.

139087171 is a deficient number, since it is larger than the sum of its proper divisors (1).

139087171 is an equidigital number, since it uses as much as digits as its factorization.

139087171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 37.

The square root of 139087171 is about 11793.5224169881. The cubic root of 139087171 is about 518.1184105902.

The spelling of 139087171 in words is "one hundred thirty-nine million, eighty-seven thousand, one hundred seventy-one".