99121783 has 2 divisors, whose sum is σ = 99121784. Its totient is φ = 99121782.

The previous prime is 99121777. The next prime is 99121801. The reversal of 99121783 is 38712199.

It is a weak prime.

It is an emirp because it is prime and its reverse (38712199) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99121783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99121733) 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, 49560891 + 49560892.

It is an arithmetic number, because the mean of its divisors is an integer number (49560892).

Almost surely, 2^99121783 is an apocalyptic number.

99121783 is a deficient number, since it is larger than the sum of its proper divisors (1).

99121783 is an equidigital number, since it uses as much as digits as its factorization.

99121783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 40.

The square root of 99121783 is about 9955.9923161883. The cubic root of 99121783 is about 462.7961121048.

The spelling of 99121783 in words is "ninety-nine million, one hundred twenty-one thousand, seven hundred eighty-three".