161223523 has 2 divisors, whose sum is σ = 161223524. Its totient is φ = 161223522.

The previous prime is 161223511. The next prime is 161223533. The reversal of 161223523 is 325322161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161223523 is a prime.

It is not a weakly prime, because it can be changed into another prime (161223533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80611761 + 80611762.

It is an arithmetic number, because the mean of its divisors is an integer number (80611762).

Almost surely, 2^161223523 is an apocalyptic number.

161223523 is a deficient number, since it is larger than the sum of its proper divisors (1).

161223523 is an equidigital number, since it uses as much as digits as its factorization.

161223523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 25.

The square root of 161223523 is about 12697.3825255444. The cubic root of 161223523 is about 544.2638243731.

Adding to 161223523 its reverse (325322161), we get a palindrome (486545684).

The spelling of 161223523 in words is "one hundred sixty-one million, two hundred twenty-three thousand, five hundred twenty-three".