171053909 has 4 divisors (see below), whose sum is σ = 184211916. Its totient is φ = 157895904.

The previous prime is 171053891. The next prime is 171053917. The reversal of 171053909 is 909350171.

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

It can be written as a sum of positive squares in 2 ways, for example, as 75307684 + 95746225 = 8678^2 + 9785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171053909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171053959) 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, 6578984 + ... + 6579009.

It is an arithmetic number, because the mean of its divisors is an integer number (46052979).

Almost surely, 2^171053909 is an apocalyptic number.

It is an amenable number.

171053909 is a deficient number, since it is larger than the sum of its proper divisors (13158007).

171053909 is a wasteful number, since it uses less digits than its factorization.

171053909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13158006.

The product of its (nonzero) digits is 8505, while the sum is 35.

The square root of 171053909 is about 13078.7579303235. The cubic root of 171053909 is about 555.1082320100.

The spelling of 171053909 in words is "one hundred seventy-one million, fifty-three thousand, nine hundred nine".