9781881879 has 48 divisors (see below), whose sum is σ = 16628804864. Its totient is φ = 5005566720.

The previous prime is 9781881869. The next prime is 9781881911.

9781881879 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9781881879 - 2¹⁷ = 9781750807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9781881869) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 141519 + ... + 198975.

Almost surely, 2^9781881879 is an apocalyptic number.

9781881879 is a deficient number, since it is larger than the sum of its proper divisors (6846922985).

9781881879 is a wasteful number, since it uses less digits than its factorization.

9781881879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57556 (or 57545 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 66.

The square root of 9781881879 is about 98903.3967010234. The cubic root of 9781881879 is about 2138.6553610013.

The spelling of 9781881879 in words is "nine billion, seven hundred eighty-one million, eight hundred eighty-one thousand, eight hundred seventy-nine".