981978042239 has 4 divisors (see below), whose sum is σ = 982121844360. Its totient is φ = 981834240120.

The previous prime is 981978042211. The next prime is 981978042257. The reversal of 981978042239 is 932240879189.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 932240879189 = 19 ⋅49065309431.

It is a cyclic number.

It is not a de Polignac number, because 981978042239 - 2³⁶ = 913258565503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981978042139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71890817 + ... + 71904474.

It is an arithmetic number, because the mean of its divisors is an integer number (245530461090).

Almost surely, 2^981978042239 is an apocalyptic number.

981978042239 is a deficient number, since it is larger than the sum of its proper divisors (143802121).

981978042239 is a wasteful number, since it uses less digits than its factorization.

981978042239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143802120.

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 981978042239 in words is "nine hundred eighty-one billion, nine hundred seventy-eight million, forty-two thousand, two hundred thirty-nine".