1122565561 has 4 divisors (see below), whose sum is σ = 1208916772. Its totient is φ = 1036214352.

The previous prime is 1122565541. The next prime is 1122565571. The reversal of 1122565561 is 1655652211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1655652211 = 83 ⋅19947617.

It can be written as a sum of positive squares in 2 ways, for example, as 113550336 + 1009015225 = 10656^2 + 31765^2 .

It is a cyclic number.

It is not a de Polignac number, because 1122565561 - 2¹⁵ = 1122532793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1122565501) 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, 43175586 + ... + 43175611.

It is an arithmetic number, because the mean of its divisors is an integer number (302229193).

Almost surely, 2^1122565561 is an apocalyptic number.

It is an amenable number.

1122565561 is a deficient number, since it is larger than the sum of its proper divisors (86351211).

1122565561 is an equidigital number, since it uses as much as digits as its factorization.

1122565561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86351210.

The product of its digits is 18000, while the sum is 34.

The square root of 1122565561 is about 33504.7095346311. The cubic root of 1122565561 is about 1039.2911716441.

The spelling of 1122565561 in words is "one billion, one hundred twenty-two million, five hundred sixty-five thousand, five hundred sixty-one".