1121200553 has 16 divisors (see below), whose sum is σ = 1233825792. Its totient is φ = 1010394000.

The previous prime is 1121200517. The next prime is 1121200567. The reversal of 1121200553 is 3550021211.

It is a happy number.

It is not a de Polignac number, because 1121200553 - 2⁶ = 1121200489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121200513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1130888 + ... + 1131878.

It is an arithmetic number, because the mean of its divisors is an integer number (77114112).

Almost surely, 2^1121200553 is an apocalyptic number.

It is an amenable number.

1121200553 is a deficient number, since it is larger than the sum of its proper divisors (112625239).

1121200553 is a wasteful number, since it uses less digits than its factorization.

1121200553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1121200553 is about 33484.3329484104. The cubic root of 1121200553 is about 1038.8697512209.

Adding to 1121200553 its reverse (3550021211), we get a palindrome (4671221764).

The spelling of 1121200553 in words is "one billion, one hundred twenty-one million, two hundred thousand, five hundred fifty-three".