2181634523 has 2 divisors, whose sum is σ = 2181634524. Its totient is φ = 2181634522.

The previous prime is 2181634513. The next prime is 2181634577. The reversal of 2181634523 is 3254361812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2181634523 - 2⁸ = 2181634267 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (2181634513) 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, 1090817261 + 1090817262.

It is an arithmetic number, because the mean of its divisors is an integer number (1090817262).

Almost surely, 2^2181634523 is an apocalyptic number.

2181634523 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181634523 is an equidigital number, since it uses as much as digits as its factorization.

2181634523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 35.

The square root of 2181634523 is about 46707.9706581222. The cubic root of 2181634523 is about 1296.9622410082.

The spelling of 2181634523 in words is "two billion, one hundred eighty-one million, six hundred thirty-four thousand, five hundred twenty-three".