109135991 has 2 divisors, whose sum is σ = 109135992. Its totient is φ = 109135990.

The previous prime is 109135987. The next prime is 109135993. The reversal of 109135991 is 199531901.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 109135991 - 2² = 109135987 is a prime.

Together with 109135993, 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 (109135993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54567995 + 54567996.

It is an arithmetic number, because the mean of its divisors is an integer number (54567996).

Almost surely, 2^109135991 is an apocalyptic number.

109135991 is a deficient number, since it is larger than the sum of its proper divisors (1).

109135991 is an equidigital number, since it uses as much as digits as its factorization.

109135991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10935, while the sum is 38.

The square root of 109135991 is about 10446.8172665171. The cubic root of 109135991 is about 477.8841928680.

The spelling of 109135991 in words is "one hundred nine million, one hundred thirty-five thousand, nine hundred ninety-one".