1121243131 has 2 divisors, whose sum is σ = 1121243132. Its totient is φ = 1121243130.

The previous prime is 1121243111. The next prime is 1121243141. The reversal of 1121243131 is 1313421211.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121243131 is a prime.

It is a super-2 number, since 2×1121243131² = 2514372317629366322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1121243099 and 1121243108.

It is not a weakly prime, because it can be changed into another prime (1121243111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560621565 + 560621566.

It is an arithmetic number, because the mean of its divisors is an integer number (560621566).

Almost surely, 2^1121243131 is an apocalyptic number.

1121243131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121243131 is an equidigital number, since it uses as much as digits as its factorization.

1121243131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 19.

The square root of 1121243131 is about 33484.9687322536. The cubic root of 1121243131 is about 1038.8829015403.

Adding to 1121243131 its reverse (1313421211), we get a palindrome (2434664342).

The spelling of 1121243131 in words is "one billion, one hundred twenty-one million, two hundred forty-three thousand, one hundred thirty-one".