91921103 has 2 divisors, whose sum is σ = 91921104. Its totient is φ = 91921102.

The previous prime is 91921051. The next prime is 91921121. The reversal of 91921103 is 30112919.

It is a strong prime.

It is an emirp because it is prime and its reverse (30112919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91921103 - 2¹⁴ = 91904719 is a prime.

It is a Sophie Germain 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 (91921163) 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, 45960551 + 45960552.

It is an arithmetic number, because the mean of its divisors is an integer number (45960552).

Almost surely, 2^91921103 is an apocalyptic number.

91921103 is a deficient number, since it is larger than the sum of its proper divisors (1).

91921103 is an equidigital number, since it uses as much as digits as its factorization.

91921103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 91921103 is about 9587.5493740580. The cubic root of 91921103 is about 451.3066598078.

It can be divided in two parts, 919 and 21103, that added together give a palindrome (22022).

The spelling of 91921103 in words is "ninety-one million, nine hundred twenty-one thousand, one hundred three".