171091939 has 4 divisors (see below), whose sum is σ = 171960624. Its totient is φ = 170223256.

The previous prime is 171091913. The next prime is 171091951. The reversal of 171091939 is 939190171.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 171091939 - 2¹³ = 171083747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171091339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434047 + ... + 434440.

It is an arithmetic number, because the mean of its divisors is an integer number (42990156).

Almost surely, 2^171091939 is an apocalyptic number.

171091939 is a deficient number, since it is larger than the sum of its proper divisors (868685).

171091939 is an equidigital number, since it uses as much as digits as its factorization.

171091939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868684.

The product of its (nonzero) digits is 15309, while the sum is 40.

The square root of 171091939 is about 13080.2117337603. The cubic root of 171091939 is about 555.1493675831.

The spelling of 171091939 in words is "one hundred seventy-one million, ninety-one thousand, nine hundred thirty-nine".