1111221455 has 4 divisors (see below), whose sum is σ = 1333465752. Its totient is φ = 888977160.

The previous prime is 1111221451. The next prime is 1111221457. The reversal of 1111221455 is 5541221111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1111221455 - 2² = 1111221451 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1111221455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111221451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111122141 + ... + 111122150.

It is an arithmetic number, because the mean of its divisors is an integer number (333366438).

Almost surely, 2^1111221455 is an apocalyptic number.

1111221455 is a deficient number, since it is larger than the sum of its proper divisors (222244297).

1111221455 is an equidigital number, since it uses as much as digits as its factorization.

1111221455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222244296.

The product of its digits is 400, while the sum is 23.

The square root of 1111221455 is about 33334.9884505755. The cubic root of 1111221455 is about 1035.7784539282.

Adding to 1111221455 its reverse (5541221111), we get a palindrome (6652442566).

The spelling of 1111221455 in words is "one billion, one hundred eleven million, two hundred twenty-one thousand, four hundred fifty-five".