1145563561 has 4 divisors (see below), whose sum is σ = 1205856400. Its totient is φ = 1085270724.

The previous prime is 1145563543. The next prime is 1145563579. The reversal of 1145563561 is 1653655411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1145563543) and next prime (1145563579).

It is a cyclic number.

It is not a de Polignac number, because 1145563561 - 2¹⁷ = 1145432489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1145563561.

It is not an unprimeable number, because it can be changed into a prime (1145563541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30146391 + ... + 30146428.

It is an arithmetic number, because the mean of its divisors is an integer number (301464100).

Almost surely, 2^1145563561 is an apocalyptic number.

It is an amenable number.

1145563561 is a deficient number, since it is larger than the sum of its proper divisors (60292839).

1145563561 is an equidigital number, since it uses as much as digits as its factorization.

1145563561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60292838.

The product of its digits is 54000, while the sum is 37.

The square root of 1145563561 is about 33846.1749832976. The cubic root of 1145563561 is about 1046.3405674827.

The spelling of 1145563561 in words is "one billion, one hundred forty-five million, five hundred sixty-three thousand, five hundred sixty-one".