171253979 has 4 divisors (see below), whose sum is σ = 184427376. Its totient is φ = 158080584.

The previous prime is 171253967. The next prime is 171253981. The reversal of 171253979 is 979352171.

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 171253979 - 2⁴ = 171253963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171253919) 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 3 ways as a sum of consecutive naturals, for example, 6586679 + ... + 6586704.

It is an arithmetic number, because the mean of its divisors is an integer number (46106844).

Almost surely, 2^171253979 is an apocalyptic number.

171253979 is a deficient number, since it is larger than the sum of its proper divisors (13173397).

171253979 is a wasteful number, since it uses less digits than its factorization.

171253979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13173396.

The product of its digits is 119070, while the sum is 44.

The square root of 171253979 is about 13086.4043571945. The cubic root of 171253979 is about 555.3245716673.

The spelling of 171253979 in words is "one hundred seventy-one million, two hundred fifty-three thousand, nine hundred seventy-nine".