139535171 has 2 divisors, whose sum is σ = 139535172. Its totient is φ = 139535170.

The previous prime is 139535147. The next prime is 139535173. The reversal of 139535171 is 171535931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139535171 is a prime.

Together with 139535173, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_7887320 and since 139535171 and 7887320 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (139535173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69767585 + 69767586.

It is an arithmetic number, because the mean of its divisors is an integer number (69767586).

Almost surely, 2^139535171 is an apocalyptic number.

139535171 is a deficient number, since it is larger than the sum of its proper divisors (1).

139535171 is an equidigital number, since it uses as much as digits as its factorization.

139535171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14175, while the sum is 35.

The square root of 139535171 is about 11812.5006243386. The cubic root of 139535171 is about 518.6741011326.

The spelling of 139535171 in words is "one hundred thirty-nine million, five hundred thirty-five thousand, one hundred seventy-one".