111721249 has 2 divisors, whose sum is σ = 111721250. Its totient is φ = 111721248.

The previous prime is 111721231. The next prime is 111721277. The reversal of 111721249 is 942127111.

It is an a-pointer prime, because the next prime (111721277) can be obtained adding 111721249 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107848225 + 3873024 = 10385^2 + 1968^2 .

It is an emirp because it is prime and its reverse (942127111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111721249 - 2⁵ = 111721217 is a prime.

It is not a weakly prime, because it can be changed into another prime (111725249) 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, 55860624 + 55860625.

It is an arithmetic number, because the mean of its divisors is an integer number (55860625).

Almost surely, 2^111721249 is an apocalyptic number.

It is an amenable number.

111721249 is a deficient number, since it is larger than the sum of its proper divisors (1).

111721249 is an equidigital number, since it uses as much as digits as its factorization.

111721249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 28.

The square root of 111721249 is about 10569.8272928180. The cubic root of 111721249 is about 481.6282220619.

It can be divided in two parts, 11172 and 1249, that added together give a palindrome (12421).

The spelling of 111721249 in words is "one hundred eleven million, seven hundred twenty-one thousand, two hundred forty-nine".