1121223131 has 4 divisors (see below), whose sum is σ = 1281397872. Its totient is φ = 961048392.

The previous prime is 1121223071. The next prime is 1121223139. The reversal of 1121223131 is 1313221211.

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

It is a cyclic number.

It is not a de Polignac number, because 1121223131 - 2³⁰ = 47481307 is a prime.

It is a super-2 number, since 2×1121223131² = 2514282618978886322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121223139) 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, 80087360 + ... + 80087373.

It is an arithmetic number, because the mean of its divisors is an integer number (320349468).

Almost surely, 2^1121223131 is an apocalyptic number.

1121223131 is a deficient number, since it is larger than the sum of its proper divisors (160174741).

1121223131 is an equidigital number, since it uses as much as digits as its factorization.

1121223131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160174740.

The product of its digits is 72, while the sum is 17.

The square root of 1121223131 is about 33484.6700894603. The cubic root of 1121223131 is about 1038.8767245329.

Adding to 1121223131 its reverse (1313221211), we get a palindrome (2434444342).

It can be divided in two parts, 11212 and 23131, that added together give a palindrome (34343).

The spelling of 1121223131 in words is "one billion, one hundred twenty-one million, two hundred twenty-three thousand, one hundred thirty-one".