1131223141 has 2 divisors, whose sum is σ = 1131223142. Its totient is φ = 1131223140.

The previous prime is 1131223133. The next prime is 1131223157. The reversal of 1131223141 is 1413221311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1097000641 + 34222500 = 33121^2 + 5850^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131223141 - 2³ = 1131223133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131223241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565611570 + 565611571.

It is an arithmetic number, because the mean of its divisors is an integer number (565611571).

Almost surely, 2^1131223141 is an apocalyptic number.

It is an amenable number.

1131223141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131223141 is an equidigital number, since it uses as much as digits as its factorization.

1131223141 is an evil number, because the sum of its binary digits is even.

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

The square root of 1131223141 is about 33633.6608325647. The cubic root of 1131223141 is about 1041.9561129242.

Adding to 1131223141 its reverse (1413221311), we get a palindrome (2544444452).

It can be divided in two parts, 11312 and 23141, that added together give a triangular number (34453 = T₂₆₂).

The spelling of 1131223141 in words is "one billion, one hundred thirty-one million, two hundred twenty-three thousand, one hundred forty-one".