171139999 has 2 divisors, whose sum is σ = 171140000. Its totient is φ = 171139998.

The previous prime is 171139981. The next prime is 171140009. The reversal of 171139999 is 999931171.

It is a strong prime.

It is an emirp because it is prime and its reverse (999931171) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171139999 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171139939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85569999 + 85570000.

It is an arithmetic number, because the mean of its divisors is an integer number (85570000).

Almost surely, 2^171139999 is an apocalyptic number.

171139999 is a deficient number, since it is larger than the sum of its proper divisors (1).

171139999 is an equidigital number, since it uses as much as digits as its factorization.

171139999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 137781, while the sum is 49.

The square root of 171139999 is about 13082.0487309901. The cubic root of 171139999 is about 555.2013434992.

The spelling of 171139999 in words is "one hundred seventy-one million, one hundred thirty-nine thousand, nine hundred ninety-nine".