991313020032303 has 16 divisors (see below), whose sum is σ = 1379220415153920. Its totient is φ = 632140581646464.

The previous prime is 991313020032299. The next prime is 991313020032341. The reversal of 991313020032303 is 303230020313199.

It is not a de Polignac number, because 991313020032303 - 2² = 991313020032299 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991313020072303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30787975 + ... + 54134327.

It is an arithmetic number, because the mean of its divisors is an integer number (86201275947120).

Almost surely, 2^{991313020032303} is an apocalyptic number.

991313020032303 is a deficient number, since it is larger than the sum of its proper divisors (387907395121617).

991313020032303 is a wasteful number, since it uses less digits than its factorization.

991313020032303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23961758.

The product of its (nonzero) digits is 78732, while the sum is 39.

The spelling of 991313020032303 in words is "nine hundred ninety-one trillion, three hundred thirteen billion, twenty million, thirty-two thousand, three hundred three".