91989103 has 2 divisors, whose sum is σ = 91989104. Its totient is φ = 91989102.

The previous prime is 91989019. The next prime is 91989109. The reversal of 91989103 is 30198919.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91989103 - 2²¹ = 89891951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91989109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45994551 + 45994552.

It is an arithmetic number, because the mean of its divisors is an integer number (45994552).

Almost surely, 2^91989103 is an apocalyptic number.

91989103 is a deficient number, since it is larger than the sum of its proper divisors (1).

91989103 is an equidigital number, since it uses as much as digits as its factorization.

91989103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 91989103 is about 9591.0949844113. The cubic root of 91989103 is about 451.4179193100.

The spelling of 91989103 in words is "ninety-one million, nine hundred eighty-nine thousand, one hundred three".