161575 has 12 divisors (see below), whose sum is σ = 209808. Its totient is φ = 123200.

The previous prime is 161573. The next prime is 161591. The reversal of 161575 is 575161.

It is not a de Polignac number, because 161575 - 2¹ = 161573 is a prime.

It is a super-2 number, since 2×161575² = 52212961250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 435 + ... + 715.

It is an arithmetic number, because the mean of its divisors is an integer number (17484).

2¹⁶¹⁵⁷⁵ is an apocalyptic number.

161575 is a deficient number, since it is larger than the sum of its proper divisors (48233).

161575 is a wasteful number, since it uses less digits than its factorization.

161575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314 (or 309 counting only the distinct ones).

The product of its digits is 1050, while the sum is 25.

The square root of 161575 is about 401.9639287299. The cubic root of 161575 is about 54.4659046626.

It can be divided in two parts, 16 and 1575, that multiplied together give a triangular number (25200 = T₂₂₄).

The spelling of 161575 in words is "one hundred sixty-one thousand, five hundred seventy-five".