623442243121 has 2 divisors, whose sum is σ = 623442243122. Its totient is φ = 623442243120.

The previous prime is 623442243113. The next prime is 623442243139. The reversal of 623442243121 is 121342244326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 502432880625 + 121009362496 = 708825^2 + 347864^2 .

It is a cyclic number.

It is not a de Polignac number, because 623442243121 - 2³ = 623442243113 is a prime.

It is not a weakly prime, because it can be changed into another prime (623442243161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311721121560 + 311721121561.

It is an arithmetic number, because the mean of its divisors is an integer number (311721121561).

Almost surely, 2^623442243121 is an apocalyptic number.

It is an amenable number.

623442243121 is a deficient number, since it is larger than the sum of its proper divisors (1).

623442243121 is an equidigital number, since it uses as much as digits as its factorization.

623442243121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 34.

Adding to 623442243121 its reverse (121342244326), we get a palindrome (744784487447).

The spelling of 623442243121 in words is "six hundred twenty-three billion, four hundred forty-two million, two hundred forty-three thousand, one hundred twenty-one".