10909991 has 2 divisors, whose sum is σ = 10909992. Its totient is φ = 10909990.

The previous prime is 10909967. The next prime is 10909993. The reversal of 10909991 is 19990901.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 10909991 - 2¹⁰ = 10908967 is a prime.

Together with 10909993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10909993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5454995 + 5454996.

It is an arithmetic number, because the mean of its divisors is an integer number (5454996).

Almost surely, 2^10909991 is an apocalyptic number.

10909991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10909991 is an equidigital number, since it uses as much as digits as its factorization.

10909991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 10909991 is about 3303.0275505966. The cubic root of 10909991 is about 221.7897462847.

The spelling of 10909991 in words is "ten million, nine hundred nine thousand, nine hundred ninety-one".