171138347 has 4 divisors (see below), whose sum is σ = 172127760. Its totient is φ = 170148936.

The previous prime is 171138343. The next prime is 171138389. The reversal of 171138347 is 743831171.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 743831171 = 19 ⋅39149009.

It is a cyclic number.

It is not a de Polignac number, because 171138347 - 2² = 171138343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171138343) 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, 494447 + ... + 494792.

It is an arithmetic number, because the mean of its divisors is an integer number (43031940).

Almost surely, 2^171138347 is an apocalyptic number.

171138347 is a deficient number, since it is larger than the sum of its proper divisors (989413).

171138347 is an equidigital number, since it uses as much as digits as its factorization.

171138347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989412.

The product of its digits is 14112, while the sum is 35.

The square root of 171138347 is about 13081.9855908803. The cubic root of 171138347 is about 555.1995570562.

The spelling of 171138347 in words is "one hundred seventy-one million, one hundred thirty-eight thousand, three hundred forty-seven".