161573 has 2 divisors, whose sum is σ = 161574. Its totient is φ = 161572.

The previous prime is 161569. The next prime is 161591. The reversal of 161573 is 375161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146689 + 14884 = 383^2 + 122^2 .

It is a cyclic number.

It is not a de Polignac number, because 161573 - 2² = 161569 is a prime.

It is a super-2 number, since 2×161573² = 52211668658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80786 + 80787.

It is an arithmetic number, because the mean of its divisors is an integer number (80787).

2¹⁶¹⁵⁷³ is an apocalyptic number.

It is an amenable number.

161573 is a deficient number, since it is larger than the sum of its proper divisors (1).

161573 is an equidigital number, since it uses as much as digits as its factorization.

161573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 630, while the sum is 23.

The square root of 161573 is about 401.9614409368. The cubic root of 161573 is about 54.4656799326.

Adding to 161573 its sum of digits (23), we get a triangular number (161596 = T₅₆₈).

The spelling of 161573 in words is "one hundred sixty-one thousand, five hundred seventy-three".