111445553 has 2 divisors, whose sum is σ = 111445554. Its totient is φ = 111445552.

The previous prime is 111445549. The next prime is 111445571. The reversal of 111445553 is 355544111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109348849 + 2096704 = 10457^2 + 1448^2 .

It is a cyclic number.

It is not a de Polignac number, because 111445553 - 2² = 111445549 is a prime.

It is a super-2 number, since 2×111445553² = 24840222566951618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111445153) 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, 55722776 + 55722777.

It is an arithmetic number, because the mean of its divisors is an integer number (55722777).

Almost surely, 2^111445553 is an apocalyptic number.

It is an amenable number.

111445553 is a deficient number, since it is larger than the sum of its proper divisors (1).

111445553 is an equidigital number, since it uses as much as digits as its factorization.

111445553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6000, while the sum is 29.

The square root of 111445553 is about 10556.7775859871. Note that the first 3 decimals coincide. The cubic root of 111445553 is about 481.2317222945.

Adding to 111445553 its reverse (355544111), we get a palindrome (466989664).

The spelling of 111445553 in words is "one hundred eleven million, four hundred forty-five thousand, five hundred fifty-three".