1145543261 has 2 divisors, whose sum is σ = 1145543262. Its totient is φ = 1145543260.

The previous prime is 1145543227. The next prime is 1145543303. The reversal of 1145543261 is 1623455411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 905107225 + 240436036 = 30085^2 + 15506^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145543261 - 2⁶ = 1145543197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1145543561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572771630 + 572771631.

It is an arithmetic number, because the mean of its divisors is an integer number (572771631).

Almost surely, 2^1145543261 is an apocalyptic number.

It is an amenable number.

1145543261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145543261 is an equidigital number, since it uses as much as digits as its factorization.

1145543261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 32.

The square root of 1145543261 is about 33845.8750957927. The cubic root of 1145543261 is about 1046.3343868744.

Adding to 1145543261 its reverse (1623455411), we get a palindrome (2768998672).

The spelling of 1145543261 in words is "one billion, one hundred forty-five million, five hundred forty-three thousand, two hundred sixty-one".