161033722 has 4 divisors (see below), whose sum is σ = 241550586. Its totient is φ = 80516860.

The previous prime is 161033681. The next prime is 161033729. The reversal of 161033722 is 227330161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 227330161 = 31 ⋅7333231.

It can be written as a sum of positive squares in only one way, i.e., 131537961 + 29495761 = 11469^2 + 5431^2 .

It is not an unprimeable number, because it can be changed into a prime (161033729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40258429 + ... + 40258432.

Almost surely, 2^161033722 is an apocalyptic number.

161033722 is a deficient number, since it is larger than the sum of its proper divisors (80516864).

161033722 is an equidigital number, since it uses as much as digits as its factorization.

161033722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80516863.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 161033722 is about 12689.9063038306. The cubic root of 161033722 is about 544.0501616267.

Adding to 161033722 its reverse (227330161), we get a palindrome (388363883).

The spelling of 161033722 in words is "one hundred sixty-one million, thirty-three thousand, seven hundred twenty-two".