99781849 has 2 divisors, whose sum is σ = 99781850. Its totient is φ = 99781848.

The previous prime is 99781817. The next prime is 99781867. The reversal of 99781849 is 94818799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99141849 + 640000 = 9957^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 99781849 - 2⁵ = 99781817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99781849.

It is not a weakly prime, because it can be changed into another prime (99781049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49890924 + 49890925.

It is an arithmetic number, because the mean of its divisors is an integer number (49890925).

Almost surely, 2^99781849 is an apocalyptic number.

It is an amenable number.

99781849 is a deficient number, since it is larger than the sum of its proper divisors (1).

99781849 is an equidigital number, since it uses as much as digits as its factorization.

99781849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 55.

The square root of 99781849 is about 9989.0864947702. The cubic root of 99781849 is about 463.8211152120.

The spelling of 99781849 in words is "ninety-nine million, seven hundred eighty-one thousand, eight hundred forty-nine".