161722 has 8 divisors (see below), whose sum is σ = 264672. Its totient is φ = 73500.

The previous prime is 161717. The next prime is 161729. The reversal of 161722 is 227161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 161722.

It is not an unprimeable number, because it can be changed into a prime (161729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3654 + ... + 3697.

It is an arithmetic number, because the mean of its divisors is an integer number (33084).

2¹⁶¹⁷²² is an apocalyptic number.

161722 is a deficient number, since it is larger than the sum of its proper divisors (102950).

161722 is a wasteful number, since it uses less digits than its factorization.

161722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7364.

The product of its digits is 168, while the sum is 19.

The square root of 161722 is about 402.1467393875. The cubic root of 161722 is about 54.4824172442.

Adding to 161722 its reverse (227161), we get a palindrome (388883).

The spelling of 161722 in words is "one hundred sixty-one thousand, seven hundred twenty-two".