67172161 has 4 divisors (see below), whose sum is σ = 76768192. Its totient is φ = 57576132.

The previous prime is 67172159. The next prime is 67172179. The reversal of 67172161 is 16127176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67172161 - 2¹ = 67172159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67172111) 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, 4798005 + ... + 4798018.

It is an arithmetic number, because the mean of its divisors is an integer number (19192048).

Almost surely, 2^67172161 is an apocalyptic number.

It is an amenable number.

67172161 is a deficient number, since it is larger than the sum of its proper divisors (9596031).

67172161 is an equidigital number, since it uses as much as digits as its factorization.

67172161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9596030.

The product of its digits is 3528, while the sum is 31.

The square root of 67172161 is about 8195.8624317396. The cubic root of 67172161 is about 406.5023931894.

The spelling of 67172161 in words is "sixty-seven million, one hundred seventy-two thousand, one hundred sixty-one".