109091491 has 2 divisors, whose sum is σ = 109091492. Its totient is φ = 109091490.

The previous prime is 109091471. The next prime is 109091497. The reversal of 109091491 is 194190901.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 109091491 - 2⁵ = 109091459 is a prime.

It is not a weakly prime, because it can be changed into another prime (109091497) 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, 54545745 + 54545746.

It is an arithmetic number, because the mean of its divisors is an integer number (54545746).

Almost surely, 2^109091491 is an apocalyptic number.

109091491 is a deficient number, since it is larger than the sum of its proper divisors (1).

109091491 is an equidigital number, since it uses as much as digits as its factorization.

109091491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 109091491 is about 10444.6872140816. The cubic root of 109091491 is about 477.8192319038.

The spelling of 109091491 in words is "one hundred nine million, ninety-one thousand, four hundred ninety-one".