161404223 has 2 divisors, whose sum is σ = 161404224. Its totient is φ = 161404222.

The previous prime is 161404219. The next prime is 161404253. The reversal of 161404223 is 322404161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161404223 - 2² = 161404219 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161404213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80702111 + 80702112.

It is an arithmetic number, because the mean of its divisors is an integer number (80702112).

Almost surely, 2^161404223 is an apocalyptic number.

161404223 is a deficient number, since it is larger than the sum of its proper divisors (1).

161404223 is an equidigital number, since it uses as much as digits as its factorization.

161404223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 161404223 is about 12704.4961726154. The cubic root of 161404223 is about 544.4670861780.

Adding to 161404223 its reverse (322404161), we get a palindrome (483808384).

The spelling of 161404223 in words is "one hundred sixty-one million, four hundred four thousand, two hundred twenty-three".