1143211261 has 2 divisors, whose sum is σ = 1143211262. Its totient is φ = 1143211260.

The previous prime is 1143211249. The next prime is 1143211283. The reversal of 1143211261 is 1621123411.

It is an a-pointer prime, because the next prime (1143211283) can be obtained adding 1143211261 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 985583236 + 157628025 = 31394^2 + 12555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1143211261 - 2¹⁵ = 1143178493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1143211561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571605630 + 571605631.

It is an arithmetic number, because the mean of its divisors is an integer number (571605631).

Almost surely, 2^1143211261 is an apocalyptic number.

It is an amenable number.

1143211261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143211261 is an equidigital number, since it uses as much as digits as its factorization.

1143211261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 22.

The square root of 1143211261 is about 33811.4072614554. The cubic root of 1143211261 is about 1045.6238915433.

Adding to 1143211261 its reverse (1621123411), we get a palindrome (2764334672).

The spelling of 1143211261 in words is "one billion, one hundred forty-three million, two hundred eleven thousand, two hundred sixty-one".