109257991 has 2 divisors, whose sum is σ = 109257992. Its totient is φ = 109257990.

The previous prime is 109257979. The next prime is 109258007. The reversal of 109257991 is 199752901.

It is a weak prime.

It is an emirp because it is prime and its reverse (199752901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 109257991 - 2⁵ = 109257959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109257901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54628995 + 54628996.

It is an arithmetic number, because the mean of its divisors is an integer number (54628996).

Almost surely, 2^109257991 is an apocalyptic number.

109257991 is a deficient number, since it is larger than the sum of its proper divisors (1).

109257991 is an equidigital number, since it uses as much as digits as its factorization.

109257991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51030, while the sum is 43.

The square root of 109257991 is about 10452.6547345638. The cubic root of 109257991 is about 478.0621975751.

The spelling of 109257991 in words is "one hundred nine million, two hundred fifty-seven thousand, nine hundred ninety-one".