11811859193 has 2 divisors, whose sum is σ = 11811859194. Its totient is φ = 11811859192.

The previous prime is 11811859187. The next prime is 11811859237. The reversal of 11811859193 is 39195811811.

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., 9145479424 + 2666379769 = 95632^2 + 51637^2 .

It is a cyclic number.

It is not a de Polignac number, because 11811859193 - 2⁸ = 11811858937 is a prime.

It is a super-2 number, since 2×11811859193² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11811859793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5905929596 + 5905929597.

It is an arithmetic number, because the mean of its divisors is an integer number (5905929597).

Almost surely, 2^11811859193 is an apocalyptic number.

It is an amenable number.

11811859193 is a deficient number, since it is larger than the sum of its proper divisors (1).

11811859193 is an equidigital number, since it uses as much as digits as its factorization.

11811859193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 47.

The spelling of 11811859193 in words is "eleven billion, eight hundred eleven million, eight hundred fifty-nine thousand, one hundred ninety-three".