111720887 has 2 divisors, whose sum is σ = 111720888. Its totient is φ = 111720886.

The previous prime is 111720863. The next prime is 111720901. The reversal of 111720887 is 788027111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111720887 - 2¹⁴ = 111704503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111720857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55860443 + 55860444.

It is an arithmetic number, because the mean of its divisors is an integer number (55860444).

Almost surely, 2^111720887 is an apocalyptic number.

111720887 is a deficient number, since it is larger than the sum of its proper divisors (1).

111720887 is an equidigital number, since it uses as much as digits as its factorization.

111720887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 35.

The square root of 111720887 is about 10569.8101685886. The cubic root of 111720887 is about 481.6277018696.

Adding to 111720887 its reverse (788027111), we get a palindrome (899747998).

The spelling of 111720887 in words is "one hundred eleven million, seven hundred twenty thousand, eight hundred eighty-seven".