1118941561 has 2 divisors, whose sum is σ = 1118941562. Its totient is φ = 1118941560.

The previous prime is 1118941541. The next prime is 1118941567. The reversal of 1118941561 is 1651498111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 770895225 + 348046336 = 27765^2 + 18656^2 .

It is a cyclic number.

It is not a de Polignac number, because 1118941561 - 2⁷ = 1118941433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1118941561.

It is not a weakly prime, because it can be changed into another prime (1118941567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 559470780 + 559470781.

It is an arithmetic number, because the mean of its divisors is an integer number (559470781).

Almost surely, 2^1118941561 is an apocalyptic number.

It is an amenable number.

1118941561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1118941561 is an equidigital number, since it uses as much as digits as its factorization.

1118941561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 37.

The square root of 1118941561 is about 33450.5838663543. The cubic root of 1118941561 is about 1038.1715780810.

The spelling of 1118941561 in words is "one billion, one hundred eighteen million, nine hundred forty-one thousand, five hundred sixty-one".