23123121181 has 2 divisors, whose sum is σ = 23123121182. Its totient is φ = 23123121180.

The previous prime is 23123121167. The next prime is 23123121227. The reversal of 23123121181 is 18112132132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20523141081 + 2599980100 = 143259^2 + 50990^2 .

It is a cyclic number.

It is not a de Polignac number, because 23123121181 - 2¹¹ = 23123119133 is a prime.

It is a super-2 number, since 2×23123121181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23123121881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11561560590 + 11561560591.

It is an arithmetic number, because the mean of its divisors is an integer number (11561560591).

Almost surely, 2^23123121181 is an apocalyptic number.

It is an amenable number.

23123121181 is a deficient number, since it is larger than the sum of its proper divisors (1).

23123121181 is an equidigital number, since it uses as much as digits as its factorization.

23123121181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 25.

The spelling of 23123121181 in words is "twenty-three billion, one hundred twenty-three million, one hundred twenty-one thousand, one hundred eighty-one".