161672573 has 4 divisors (see below), whose sum is σ = 166042140. Its totient is φ = 157303008.

The previous prime is 161672557. The next prime is 161672587. The reversal of 161672573 is 375276161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 106956964 + 54715609 = 10342^2 + 7397^2 .

It is a cyclic number.

It is not a de Polignac number, because 161672573 - 2⁴ = 161672557 is a prime.

It is a super-2 number, since 2×161672573² = 52276041720880658, 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 (161672503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2184728 + ... + 2184801.

It is an arithmetic number, because the mean of its divisors is an integer number (41510535).

Almost surely, 2^161672573 is an apocalyptic number.

It is an amenable number.

161672573 is a deficient number, since it is larger than the sum of its proper divisors (4369567).

161672573 is an equidigital number, since it uses as much as digits as its factorization.

161672573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4369566.

The product of its digits is 52920, while the sum is 38.

The square root of 161672573 is about 12715.0530081475. The cubic root of 161672573 is about 544.7686620225.

The spelling of 161672573 in words is "one hundred sixty-one million, six hundred seventy-two thousand, five hundred seventy-three".