1131121533 has 4 divisors (see below), whose sum is σ = 1508162048. Its totient is φ = 754081020.

The previous prime is 1131121517. The next prime is 1131121543. The reversal of 1131121533 is 3351211311.

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.

It is not a de Polignac number, because 1131121533 - 2⁴ = 1131121517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131121513) 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, 188520253 + ... + 188520258.

It is an arithmetic number, because the mean of its divisors is an integer number (377040512).

Almost surely, 2^1131121533 is an apocalyptic number.

It is an amenable number.

1131121533 is a deficient number, since it is larger than the sum of its proper divisors (377040515).

1131121533 is an equidigital number, since it uses as much as digits as its factorization.

1131121533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377040514.

The product of its digits is 270, while the sum is 21.

The square root of 1131121533 is about 33632.1502880800. The cubic root of 1131121533 is about 1041.9249153521.

Adding to 1131121533 its reverse (3351211311), we get a palindrome (4482332844).

The spelling of 1131121533 in words is "one billion, one hundred thirty-one million, one hundred twenty-one thousand, five hundred thirty-three".