991303236055513 has 8 divisors (see below), whose sum is σ = 1049615480878920. Its totient is φ = 932991023427840.

The previous prime is 991303236055459. The next prime is 991303236055553. The reversal of 991303236055513 is 315550632303199.

It can be written as a sum of positive squares in 4 ways, for example, as 10654720920649 + 980648515134864 = 3264157^2 + 31315308^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-991303236055513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991303236055553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88282783 + ... + 98875963.

It is an arithmetic number, because the mean of its divisors is an integer number (131201935109865).

Almost surely, 2^{991303236055513} is an apocalyptic number.

It is an amenable number.

991303236055513 is a deficient number, since it is larger than the sum of its proper divisors (58312244823407).

991303236055513 is a wasteful number, since it uses less digits than its factorization.

991303236055513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16097867.

The product of its (nonzero) digits is 9841500, while the sum is 55.

The spelling of 991303236055513 in words is "nine hundred ninety-one trillion, three hundred three billion, two hundred thirty-six million, fifty-five thousand, five hundred thirteen".