1121255533 has 4 divisors (see below), whose sum is σ = 1121418940. Its totient is φ = 1121092128.

The previous prime is 1121255489. The next prime is 1121255537. The reversal of 1121255533 is 3355521211.

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

It can be written as a sum of positive squares in 2 ways, for example, as 509088969 + 612166564 = 22563^2 + 24742^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121255533 - 2⁹ = 1121255021 is a prime.

It is a super-2 number, since 2×1121255533² = 2514427940566228178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121255537) 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, 70938 + ... + 85291.

It is an arithmetic number, because the mean of its divisors is an integer number (280354735).

Almost surely, 2^1121255533 is an apocalyptic number.

It is an amenable number.

1121255533 is a deficient number, since it is larger than the sum of its proper divisors (163407).

1121255533 is an equidigital number, since it uses as much as digits as its factorization.

1121255533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163406.

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

The square root of 1121255533 is about 33485.1539193118. The cubic root of 1121255533 is about 1038.8867318658.

Adding to 1121255533 its reverse (3355521211), we get a palindrome (4476776744).

The spelling of 1121255533 in words is "one billion, one hundred twenty-one million, two hundred fifty-five thousand, five hundred thirty-three".