1121253553 has 4 divisors (see below), whose sum is σ = 1281432640. Its totient is φ = 961074468.

The previous prime is 1121253541. The next prime is 1121253577. The reversal of 1121253553 is 3553521211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3553521211 = 193 ⋅18412027.

It is a cyclic number.

It is not a de Polignac number, because 1121253553 - 2⁵ = 1121253521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121253583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80089533 + ... + 80089546.

It is an arithmetic number, because the mean of its divisors is an integer number (320358160).

Almost surely, 2^1121253553 is an apocalyptic number.

It is an amenable number.

1121253553 is a deficient number, since it is larger than the sum of its proper divisors (160179087).

1121253553 is an equidigital number, since it uses as much as digits as its factorization.

1121253553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160179086.

The product of its digits is 4500, while the sum is 28.

The square root of 1121253553 is about 33485.1243539575. The cubic root of 1121253553 is about 1038.8861203498.

Adding to 1121253553 its reverse (3553521211), we get a palindrome (4674774764).

The spelling of 1121253553 in words is "one billion, one hundred twenty-one million, two hundred fifty-three thousand, five hundred fifty-three".