1121431331 has 2 divisors, whose sum is σ = 1121431332. Its totient is φ = 1121431330.

The previous prime is 1121431321. The next prime is 1121431393. The reversal of 1121431331 is 1331341211.

It is a weak prime.

It is an emirp because it is prime and its reverse (1331341211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1121431331 - 2²² = 1117237027 is a prime.

It is a super-2 number, since 2×1121431331² = 2515216460296863122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1121431321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560715665 + 560715666.

It is an arithmetic number, because the mean of its divisors is an integer number (560715666).

Almost surely, 2^1121431331 is an apocalyptic number.

1121431331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121431331 is an equidigital number, since it uses as much as digits as its factorization.

1121431331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 20.

The square root of 1121431331 is about 33487.7788304928. The cubic root of 1121431331 is about 1038.9410235832.

Adding to 1121431331 its reverse (1331341211), we get a palindrome (2452772542).

The spelling of 1121431331 in words is "one billion, one hundred twenty-one million, four hundred thirty-one thousand, three hundred thirty-one".