11581560889 has 2 divisors, whose sum is σ = 11581560890. Its totient is φ = 11581560888.

The previous prime is 11581560869. The next prime is 11581560899. The reversal of 11581560889 is 98806518511.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11434666489 + 146894400 = 106933^2 + 12120^2 .

It is a cyclic number.

It is not a de Polignac number, because 11581560889 - 2⁹ = 11581560377 is a prime.

It is a super-2 number, since 2×11581560889² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11581560869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5790780444 + 5790780445.

It is an arithmetic number, because the mean of its divisors is an integer number (5790780445).

Almost surely, 2^11581560889 is an apocalyptic number.

It is an amenable number.

11581560889 is a deficient number, since it is larger than the sum of its proper divisors (1).

11581560889 is an equidigital number, since it uses as much as digits as its factorization.

11581560889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 691200, while the sum is 52.

The spelling of 11581560889 in words is "eleven billion, five hundred eighty-one million, five hundred sixty thousand, eight hundred eighty-nine".