23287842181 has 2 divisors, whose sum is σ = 23287842182. Its totient is φ = 23287842180.

The previous prime is 23287842163. The next prime is 23287842251. The reversal of 23287842181 is 18124878232.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19106150625 + 4181691556 = 138225^2 + 64666^2 .

It is a cyclic number.

It is not a de Polignac number, because 23287842181 - 2²¹ = 23285745029 is a prime.

It is a super-2 number, since 2×23287842181² (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 (23287842101) 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, 11643921090 + 11643921091.

It is an arithmetic number, because the mean of its divisors is an integer number (11643921091).

Almost surely, 2^23287842181 is an apocalyptic number.

It is an amenable number.

23287842181 is a deficient number, since it is larger than the sum of its proper divisors (1).

23287842181 is an equidigital number, since it uses as much as digits as its factorization.

23287842181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 344064, while the sum is 46.

The spelling of 23287842181 in words is "twenty-three billion, two hundred eighty-seven million, eight hundred forty-two thousand, one hundred eighty-one".