11031009991 has 2 divisors, whose sum is σ = 11031009992. Its totient is φ = 11031009990.

The previous prime is 11031009947. The next prime is 11031010007. The reversal of 11031009991 is 19990013011.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11031009991 - 2¹⁷ = 11030878919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11031009391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5515504995 + 5515504996.

It is an arithmetic number, because the mean of its divisors is an integer number (5515504996).

Almost surely, 2^11031009991 is an apocalyptic number.

11031009991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11031009991 is an equidigital number, since it uses as much as digits as its factorization.

11031009991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2187, while the sum is 34.

The spelling of 11031009991 in words is "eleven billion, thirty-one million, nine thousand, nine hundred ninety-one".