111420817 has 2 divisors, whose sum is σ = 111420818. Its totient is φ = 111420816.

The previous prime is 111420689. The next prime is 111420847. The reversal of 111420817 is 718024111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101123136 + 10297681 = 10056^2 + 3209^2 .

It is a cyclic number.

It is not a de Polignac number, because 111420817 - 2⁷ = 111420689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111420791 and 111420800.

It is not a weakly prime, because it can be changed into another prime (111420847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55710408 + 55710409.

It is an arithmetic number, because the mean of its divisors is an integer number (55710409).

Almost surely, 2^111420817 is an apocalyptic number.

It is an amenable number.

111420817 is a deficient number, since it is larger than the sum of its proper divisors (1).

111420817 is an equidigital number, since it uses as much as digits as its factorization.

111420817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 25.

The square root of 111420817 is about 10555.6059513417. The cubic root of 111420817 is about 481.1961155838.

Adding to 111420817 its reverse (718024111), we get a palindrome (829444928).

The spelling of 111420817 in words is "one hundred eleven million, four hundred twenty thousand, eight hundred seventeen".