161275573 has 4 divisors (see below), whose sum is σ = 161305888. Its totient is φ = 161245260.

The previous prime is 161275571. The next prime is 161275579. The reversal of 161275573 is 375572161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 375572161 = 31 ⋅12115231.

It is a cyclic number.

It is not a de Polignac number, because 161275573 - 2¹ = 161275571 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161275571) 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, 4833 + ... + 18598.

It is an arithmetic number, because the mean of its divisors is an integer number (40326472).

Almost surely, 2^161275573 is an apocalyptic number.

It is an amenable number.

161275573 is a deficient number, since it is larger than the sum of its proper divisors (30315).

161275573 is an equidigital number, since it uses as much as digits as its factorization.

161275573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30314.

The product of its digits is 44100, while the sum is 37.

The square root of 161275573 is about 12699.4319951721. The cubic root of 161275573 is about 544.3223887883.

The spelling of 161275573 in words is "one hundred sixty-one million, two hundred seventy-five thousand, five hundred seventy-three".