161212226 has 32 divisors (see below), whose sum is σ = 291947520. Its totient is φ = 65221200.

The previous prime is 161212223. The next prime is 161212231. The reversal of 161212226 is 622212161.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (161212223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87131 + ... + 88961.

It is an arithmetic number, because the mean of its divisors is an integer number (9123360).

Almost surely, 2^161212226 is an apocalyptic number.

161212226 is a deficient number, since it is larger than the sum of its proper divisors (130735294).

161212226 is a wasteful number, since it uses less digits than its factorization.

161212226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190.

The product of its digits is 576, while the sum is 23.

The square root of 161212226 is about 12696.9376622869. The cubic root of 161212226 is about 544.2511118112.

Adding to 161212226 its reverse (622212161), we get a palindrome (783424387).

The spelling of 161212226 in words is "one hundred sixty-one million, two hundred twelve thousand, two hundred twenty-six".