991676549 has 2 divisors, whose sum is σ = 991676550. Its totient is φ = 991676548.

The previous prime is 991676531. The next prime is 991676597. The reversal of 991676549 is 945676199.

991676549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 948024100 + 43652449 = 30790^2 + 6607^2 .

It is a cyclic number.

It is not a de Polignac number, because 991676549 - 2⁸ = 991676293 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 991676494 and 991676503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991676149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495838274 + 495838275.

It is an arithmetic number, because the mean of its divisors is an integer number (495838275).

Almost surely, 2^991676549 is an apocalyptic number.

It is an amenable number.

991676549 is a deficient number, since it is larger than the sum of its proper divisors (1).

991676549 is an equidigital number, since it uses as much as digits as its factorization.

991676549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3674160, while the sum is 56.

The square root of 991676549 is about 31490.8962876575. The cubic root of 991676549 is about 997.2177827795.

The spelling of 991676549 in words is "nine hundred ninety-one million, six hundred seventy-six thousand, five hundred forty-nine".