623220161 has 2 divisors, whose sum is σ = 623220162. Its totient is φ = 623220160.

The previous prime is 623220149. The next prime is 623220211. The reversal of 623220161 is 161022326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 616032400 + 7187761 = 24820^2 + 2681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623220161 is a prime.

It is a Chen prime.

It is equal to p_32472311 and since 623220161 and 32472311 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (623220061) 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, 311610080 + 311610081.

It is an arithmetic number, because the mean of its divisors is an integer number (311610081).

Almost surely, 2^623220161 is an apocalyptic number.

It is an amenable number.

623220161 is a deficient number, since it is larger than the sum of its proper divisors (1).

623220161 is an equidigital number, since it uses as much as digits as its factorization.

623220161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 623220161 is about 24964.3778412361. The cubic root of 623220161 is about 854.1756065448.

Adding to 623220161 its reverse (161022326), we get a palindrome (784242487).

It can be divided in two parts, 62 and 3220161, that added together give a palindrome (3220223).

The spelling of 623220161 in words is "six hundred twenty-three million, two hundred twenty thousand, one hundred sixty-one".