2002123511 has 2 divisors, whose sum is σ = 2002123512. Its totient is φ = 2002123510.

The previous prime is 2002123399. The next prime is 2002123567. The reversal of 2002123511 is 1153212002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2002123511 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2002123511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2002123811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001061755 + 1001061756.

It is an arithmetic number, because the mean of its divisors is an integer number (1001061756).

Almost surely, 2^2002123511 is an apocalyptic number.

2002123511 is a deficient number, since it is larger than the sum of its proper divisors (1).

2002123511 is an equidigital number, since it uses as much as digits as its factorization.

2002123511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 2002123511 is about 44745.0948261371. The cubic root of 2002123511 is about 1260.3668015404.

Adding to 2002123511 its reverse (1153212002), we get a palindrome (3155335513).

The spelling of 2002123511 in words is "two billion, two million, one hundred twenty-three thousand, five hundred eleven".