171345551 has 6 divisors (see below), whose sum is σ = 185540040. Its totient is φ = 158164968.

The previous prime is 171345541. The next prime is 171345563. The reversal of 171345551 is 155543171.

171345551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 171345551 - 2¹⁴ = 171329167 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 (171345541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 506771 + ... + 507108.

It is an arithmetic number, because the mean of its divisors is an integer number (30923340).

Almost surely, 2^171345551 is an apocalyptic number.

171345551 is a deficient number, since it is larger than the sum of its proper divisors (14194489).

171345551 is a wasteful number, since it uses less digits than its factorization.

171345551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013905 (or 1013892 counting only the distinct ones).

The product of its digits is 10500, while the sum is 32.

The square root of 171345551 is about 13089.9026352376. The cubic root of 171345551 is about 555.4235340794.

The spelling of 171345551 in words is "one hundred seventy-one million, three hundred forty-five thousand, five hundred fifty-one".