1121518555 has 4 divisors (see below), whose sum is σ = 1345822272. Its totient is φ = 897214840.

The previous prime is 1121518547. The next prime is 1121518583. The reversal of 1121518555 is 5558151211.

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

It is not a de Polignac number, because 1121518555 - 2³ = 1121518547 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 1121518555.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112151851 + ... + 112151860.

It is an arithmetic number, because the mean of its divisors is an integer number (336455568).

Almost surely, 2^1121518555 is an apocalyptic number.

1121518555 is a deficient number, since it is larger than the sum of its proper divisors (224303717).

1121518555 is an equidigital number, since it uses as much as digits as its factorization.

1121518555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224303716.

The product of its digits is 10000, while the sum is 34.

The square root of 1121518555 is about 33489.0811310194. The cubic root of 1121518555 is about 1038.9679588756.

Adding to 1121518555 its reverse (5558151211), we get a palindrome (6679669766).

The spelling of 1121518555 in words is "one billion, one hundred twenty-one million, five hundred eighteen thousand, five hundred fifty-five".