991301000849 has 2 divisors, whose sum is σ = 991301000850. Its totient is φ = 991301000848.

The previous prime is 991301000779. The next prime is 991301000869. The reversal of 991301000849 is 948000103199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 561480462400 + 429820538449 = 749320^2 + 655607^2 .

It is a cyclic number.

It is not a de Polignac number, because 991301000849 - 2⁸ = 991301000593 is a prime.

It is not a weakly prime, because it can be changed into another prime (991301000869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495650500424 + 495650500425.

It is an arithmetic number, because the mean of its divisors is an integer number (495650500425).

Almost surely, 2^991301000849 is an apocalyptic number.

It is an amenable number.

991301000849 is a deficient number, since it is larger than the sum of its proper divisors (1).

991301000849 is an equidigital number, since it uses as much as digits as its factorization.

991301000849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 44.

The spelling of 991301000849 in words is "nine hundred ninety-one billion, three hundred one million, eight hundred forty-nine", and thus it is an aban number.