171191949 has 8 divisors (see below), whose sum is σ = 230276352. Its totient is φ = 113117760.

The previous prime is 171191929. The next prime is 171191953. The reversal of 171191949 is 949191171.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 171191949 - 2⁷ = 171191821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 171191949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171191929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252157 + ... + 252834.

It is an arithmetic number, because the mean of its divisors is an integer number (28784544).

Almost surely, 2^171191949 is an apocalyptic number.

It is an amenable number.

171191949 is a deficient number, since it is larger than the sum of its proper divisors (59084403).

171191949 is a wasteful number, since it uses less digits than its factorization.

171191949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505107.

The product of its digits is 20412, while the sum is 42.

The square root of 171191949 is about 13084.0341256051. The cubic root of 171191949 is about 555.2575154287.

The spelling of 171191949 in words is "one hundred seventy-one million, one hundred ninety-one thousand, nine hundred forty-nine".