1145632561 has 2 divisors, whose sum is σ = 1145632562. Its totient is φ = 1145632560.

The previous prime is 1145632547. The next prime is 1145632589. The reversal of 1145632561 is 1652365411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1145416336 + 216225 = 33844^2 + 465^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145632561 - 2¹⁹ = 1145108273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1145132561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572816280 + 572816281.

It is an arithmetic number, because the mean of its divisors is an integer number (572816281).

Almost surely, 2^1145632561 is an apocalyptic number.

It is an amenable number.

1145632561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145632561 is an equidigital number, since it uses as much as digits as its factorization.

1145632561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 1145632561 is about 33847.1942854943. The cubic root of 1145632561 is about 1046.3615749158.

Adding to 1145632561 its reverse (1652365411), we get a palindrome (2797997972).

The spelling of 1145632561 in words is "one billion, one hundred forty-five million, six hundred thirty-two thousand, five hundred sixty-one".