991011013301 has 2 divisors, whose sum is σ = 991011013302. Its totient is φ = 991011013300.

The previous prime is 991011013261. The next prime is 991011013319. The reversal of 991011013301 is 103310110199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 981385441201 + 9625572100 = 990649^2 + 98110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991011013301 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991011018301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495505506650 + 495505506651.

It is an arithmetic number, because the mean of its divisors is an integer number (495505506651).

Almost surely, 2^991011013301 is an apocalyptic number.

It is an amenable number.

991011013301 is a deficient number, since it is larger than the sum of its proper divisors (1).

991011013301 is an equidigital number, since it uses as much as digits as its factorization.

991011013301 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 29.

The spelling of 991011013301 in words is "nine hundred ninety-one billion, eleven million, thirteen thousand, three hundred one".