161672873 has 8 divisors (see below), whose sum is σ = 171294120. Its totient is φ = 152064000.

The previous prime is 161672857. The next prime is 161672891. The reversal of 161672873 is 378276161.

It can be written as a sum of positive squares in 4 ways, for example, as 73068304 + 88604569 = 8548^2 + 9413^2 .

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 161672873 - 2⁴ = 161672857 is a prime.

It is a super-2 number, since 2×161672873² = 52276235728148258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161672873.

It is not an unprimeable number, because it can be changed into a prime (161672813) 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, 49433 + ... + 52601.

It is an arithmetic number, because the mean of its divisors is an integer number (21411765).

Almost surely, 2^161672873 is an apocalyptic number.

It is an amenable number.

161672873 is a deficient number, since it is larger than the sum of its proper divisors (9621247).

161672873 is a wasteful number, since it uses less digits than its factorization.

161672873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6187.

The product of its digits is 84672, while the sum is 41.

The square root of 161672873 is about 12715.0648051829. The cubic root of 161672873 is about 544.7689989802.

The spelling of 161672873 in words is "one hundred sixty-one million, six hundred seventy-two thousand, eight hundred seventy-three".