161220106 has 8 divisors (see below), whose sum is σ = 250169220. Its totient is φ = 77830368.

The previous prime is 161220089. The next prime is 161220131. The reversal of 161220106 is 601022161.

It can be written as a sum of positive squares in 2 ways, for example, as 145419481 + 15800625 = 12059^2 + 3975^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1389771 + ... + 1389886.

Almost surely, 2^161220106 is an apocalyptic number.

161220106 is a deficient number, since it is larger than the sum of its proper divisors (88949114).

161220106 is a wasteful number, since it uses less digits than its factorization.

161220106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779688.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 161220106 is about 12697.2479695405. The cubic root of 161220106 is about 544.2599792712.

Adding to 161220106 its reverse (601022161), we get a palindrome (762242267).

The spelling of 161220106 in words is "one hundred sixty-one million, two hundred twenty thousand, one hundred six".