161322418 has 16 divisors (see below), whose sum is σ = 265054680. Its totient is φ = 73298176.

The previous prime is 161322409. The next prime is 161322431. The reversal of 161322418 is 814223161.

It can be written as a sum of positive squares in 4 ways, for example, as 156425049 + 4897369 = 12507^2 + 2213^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80821 + ... + 82792.

Almost surely, 2^161322418 is an apocalyptic number.

161322418 is a deficient number, since it is larger than the sum of its proper divisors (103732262).

161322418 is a wasteful number, since it uses less digits than its factorization.

161322418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163661.

The product of its digits is 2304, while the sum is 28.

The square root of 161322418 is about 12701.2762350876. The cubic root of 161322418 is about 544.3750859893.

Adding to 161322418 its reverse (814223161), we get a palindrome (975545579).

The spelling of 161322418 in words is "one hundred sixty-one million, three hundred twenty-two thousand, four hundred eighteen".