161628173 has 8 divisors (see below), whose sum is σ = 189710592. Its totient is φ = 134793936.

The previous prime is 161628169. The next prime is 161628209. The reversal of 161628173 is 371826161.

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

It is a cyclic number.

It is not a de Polignac number, because 161628173 - 2² = 161628169 is a prime.

It is a super-2 number, since 2×161628173² = 52247332614635858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161628133) 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, 311765 + ... + 312282.

It is an arithmetic number, because the mean of its divisors is an integer number (23713824).

Almost surely, 2^161628173 is an apocalyptic number.

It is an amenable number.

161628173 is a deficient number, since it is larger than the sum of its proper divisors (28082419).

161628173 is an equidigital number, since it uses as much as digits as its factorization.

161628173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624091.

The product of its digits is 12096, while the sum is 35.

The square root of 161628173 is about 12713.3069262092. The cubic root of 161628173 is about 544.7187876731.

The spelling of 161628173 in words is "one hundred sixty-one million, six hundred twenty-eight thousand, one hundred seventy-three".