161520171 has 8 divisors (see below), whose sum is σ = 217451520. Its totient is φ = 106634472.

The previous prime is 161520157. The next prime is 161520173. The reversal of 161520171 is 171025161.

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

It is not a de Polignac number, because 161520171 - 2¹³ = 161511979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161520173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261051 + ... + 261668.

It is an arithmetic number, because the mean of its divisors is an integer number (27181440).

Almost surely, 2^161520171 is an apocalyptic number.

161520171 is a deficient number, since it is larger than the sum of its proper divisors (55931349).

161520171 is a wasteful number, since it uses less digits than its factorization.

161520171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522825.

The product of its (nonzero) digits is 420, while the sum is 24.

The square root of 161520171 is about 12709.0586197405. The cubic root of 161520171 is about 544.5974312988.

The spelling of 161520171 in words is "one hundred sixty-one million, five hundred twenty thousand, one hundred seventy-one".