1111561369 has 2 divisors, whose sum is σ = 1111561370. Its totient is φ = 1111561368.

The previous prime is 1111561349. The next prime is 1111561393. The reversal of 1111561369 is 9631651111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 623151369 + 488410000 = 24963^2 + 22100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111561369 - 2¹¹ = 1111559321 is a prime.

It is a super-2 number, since 2×1111561369² = 2471137354106308322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1111561349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555780684 + 555780685.

It is an arithmetic number, because the mean of its divisors is an integer number (555780685).

Almost surely, 2^1111561369 is an apocalyptic number.

It is an amenable number.

1111561369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111561369 is an equidigital number, since it uses as much as digits as its factorization.

1111561369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 34.

The square root of 1111561369 is about 33340.0865175842. The cubic root of 1111561369 is about 1035.8840553523.

The spelling of 1111561369 in words is "one billion, one hundred eleven million, five hundred sixty-one thousand, three hundred sixty-nine".