109648991 has 2 divisors, whose sum is σ = 109648992. Its totient is φ = 109648990.

The previous prime is 109648961. The next prime is 109649003. The reversal of 109648991 is 199846901.

It is a strong prime.

It is an emirp because it is prime and its reverse (199846901) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109648991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109648901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54824495 + 54824496.

It is an arithmetic number, because the mean of its divisors is an integer number (54824496).

Almost surely, 2^109648991 is an apocalyptic number.

109648991 is a deficient number, since it is larger than the sum of its proper divisors (1).

109648991 is an equidigital number, since it uses as much as digits as its factorization.

109648991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 109648991 is about 10471.3414135917. The cubic root of 109648991 is about 478.6317967446.

The spelling of 109648991 in words is "one hundred nine million, six hundred forty-eight thousand, nine hundred ninety-one".