161378171 has 4 divisors (see below), whose sum is σ = 161526912. Its totient is φ = 161229432.

The previous prime is 161378167. The next prime is 161378177. The reversal of 161378171 is 171873161.

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 161378171 - 2² = 161378167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161378177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72731 + ... + 74916.

It is an arithmetic number, because the mean of its divisors is an integer number (40381728).

Almost surely, 2^161378171 is an apocalyptic number.

161378171 is a deficient number, since it is larger than the sum of its proper divisors (148741).

161378171 is a wasteful number, since it uses less digits than its factorization.

161378171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148740.

The product of its digits is 7056, while the sum is 35.

The square root of 161378171 is about 12703.4708249360. The cubic root of 161378171 is about 544.4377907450.

The spelling of 161378171 in words is "one hundred sixty-one million, three hundred seventy-eight thousand, one hundred seventy-one".