111638873 has 2 divisors, whose sum is σ = 111638874. Its totient is φ = 111638872.

The previous prime is 111638869. The next prime is 111638887. The reversal of 111638873 is 378836111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69089344 + 42549529 = 8312^2 + 6523^2 .

It is an emirp because it is prime and its reverse (378836111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111638873 - 2² = 111638869 is a prime.

It is not a weakly prime, because it can be changed into another prime (111637873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55819436 + 55819437.

It is an arithmetic number, because the mean of its divisors is an integer number (55819437).

Almost surely, 2^111638873 is an apocalyptic number.

It is an amenable number.

111638873 is a deficient number, since it is larger than the sum of its proper divisors (1).

111638873 is an equidigital number, since it uses as much as digits as its factorization.

111638873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 38.

The square root of 111638873 is about 10565.9298218377. The cubic root of 111638873 is about 481.5098191561.

The spelling of 111638873 in words is "one hundred eleven million, six hundred thirty-eight thousand, eight hundred seventy-three".