991286339442 has 24 divisors (see below), whose sum is σ = 2306258014896. Its totient is φ = 283224668328.

The previous prime is 991286339441. The next prime is 991286339521. The reversal of 991286339442 is 244933682199.

It is not an unprimeable number, because it can be changed into a prime (991286339441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1685860828 + ... + 1685861415.

It is an arithmetic number, because the mean of its divisors is an integer number (96094083954).

Almost surely, 2^991286339442 is an apocalyptic number.

991286339442 is an abundant number, since it is smaller than the sum of its proper divisors (1314971675454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991286339442 is a wasteful number, since it uses less digits than its factorization.

991286339442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3371722262 (or 3371722255 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 60.

The spelling of 991286339442 in words is "nine hundred ninety-one billion, two hundred eighty-six million, three hundred thirty-nine thousand, four hundred forty-two".