161212223 has 2 divisors, whose sum is σ = 161212224. Its totient is φ = 161212222.

The previous prime is 161212211. The next prime is 161212231. The reversal of 161212223 is 322212161.

It is a strong prime.

It is an emirp because it is prime and its reverse (322212161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161212223 - 2¹⁰ = 161211199 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161212195 and 161212204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161212243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80606111 + 80606112.

It is an arithmetic number, because the mean of its divisors is an integer number (80606112).

Almost surely, 2^161212223 is an apocalyptic number.

161212223 is a deficient number, since it is larger than the sum of its proper divisors (1).

161212223 is an equidigital number, since it uses as much as digits as its factorization.

161212223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 20.

The square root of 161212223 is about 12696.9375441482. The cubic root of 161212223 is about 544.2511084352.

Adding to 161212223 its reverse (322212161), we get a palindrome (483424384).

The spelling of 161212223 in words is "one hundred sixty-one million, two hundred twelve thousand, two hundred twenty-three".