161737 has 4 divisors (see below), whose sum is σ = 162756. Its totient is φ = 160720.

The previous prime is 161731. The next prime is 161741. The reversal of 161737 is 737161.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 737161 = 571 ⋅1291.

It can be written as a sum of positive squares in 2 ways, for example, as 112896 + 48841 = 336^2 + 221^2 .

It is a cyclic number.

It is not a de Polignac number, because 161737 - 2³ = 161729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161731) 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 3 ways as a sum of consecutive naturals, for example, 214 + ... + 607.

It is an arithmetic number, because the mean of its divisors is an integer number (40689).

2¹⁶¹⁷³⁷ is an apocalyptic number.

It is an amenable number.

161737 is a deficient number, since it is larger than the sum of its proper divisors (1019).

161737 is an equidigital number, since it uses as much as digits as its factorization.

161737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018.

The product of its digits is 882, while the sum is 25.

The square root of 161737 is about 402.1653888638. The cubic root of 161737 is about 54.4841016388.

Adding to 161737 its reverse (737161), we get a palindrome (898898).

It can be divided in two parts, 161 and 737, that added together give a palindrome (898).

The spelling of 161737 in words is "one hundred sixty-one thousand, seven hundred thirty-seven".