991011013319 has 2 divisors, whose sum is σ = 991011013320. Its totient is φ = 991011013318.

The previous prime is 991011013301. The next prime is 991011013357. The reversal of 991011013319 is 913310110199.

It is an a-pointer prime, because the next prime (991011013357) can be obtained adding 991011013319 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 991011013319 - 2⁸ = 991011013063 is a prime.

It is a super-2 number, since 2×991011013319² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991011013819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495505506659 + 495505506660.

It is an arithmetic number, because the mean of its divisors is an integer number (495505506660).

Almost surely, 2^991011013319 is an apocalyptic number.

991011013319 is a deficient number, since it is larger than the sum of its proper divisors (1).

991011013319 is an equidigital number, since it uses as much as digits as its factorization.

991011013319 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6561, while the sum is 38.

The spelling of 991011013319 in words is "nine hundred ninety-one billion, eleven million, thirteen thousand, three hundred nineteen".