111821602873 has 2 divisors, whose sum is σ = 111821602874. Its totient is φ = 111821602872.

The previous prime is 111821602859. The next prime is 111821602897. The reversal of 111821602873 is 378206128111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73133466624 + 38688136249 = 270432^2 + 196693^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111821602873 is a prime.

It is not a weakly prime, because it can be changed into another prime (111821602573) 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, 55910801436 + 55910801437.

It is an arithmetic number, because the mean of its divisors is an integer number (55910801437).

Almost surely, 2^111821602873 is an apocalyptic number.

It is an amenable number.

111821602873 is a deficient number, since it is larger than the sum of its proper divisors (1).

111821602873 is an equidigital number, since it uses as much as digits as its factorization.

111821602873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 40.

The spelling of 111821602873 in words is "one hundred eleven billion, eight hundred twenty-one million, six hundred two thousand, eight hundred seventy-three".