111509921 has 2 divisors, whose sum is σ = 111509922. Its totient is φ = 111509920.

The previous prime is 111509903. The next prime is 111509929. The reversal of 111509921 is 129905111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86118400 + 25391521 = 9280^2 + 5039^2 .

It is a cyclic number.

It is not a de Polignac number, because 111509921 - 2⁶ = 111509857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111509929) 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, 55754960 + 55754961.

It is an arithmetic number, because the mean of its divisors is an integer number (55754961).

Almost surely, 2^111509921 is an apocalyptic number.

It is an amenable number.

111509921 is a deficient number, since it is larger than the sum of its proper divisors (1).

111509921 is an equidigital number, since it uses as much as digits as its factorization.

111509921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 29.

The square root of 111509921 is about 10559.8258034875. The cubic root of 111509921 is about 481.3243533625.

The spelling of 111509921 in words is "one hundred eleven million, five hundred nine thousand, nine hundred twenty-one".