999982999981 has 4 divisors (see below), whose sum is σ = 1142837714272. Its totient is φ = 857128285692.

The previous prime is 999982999973. The next prime is 999982999991. The reversal of 999982999981 is 189999289999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 999982999981 - 2³ = 999982999973 is a prime.

It is a super-2 number, since 2×999982999981² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999982999901) 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, 71427357135 + ... + 71427357148.

It is an arithmetic number, because the mean of its divisors is an integer number (285709428568).

Almost surely, 2^999982999981 is an apocalyptic number.

It is an amenable number.

999982999981 is a deficient number, since it is larger than the sum of its proper divisors (142854714291).

999982999981 is a wasteful number, since it uses less digits than its factorization.

999982999981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142854714290.

The product of its digits is 5509980288, while the sum is 91.

The spelling of 999982999981 in words is "nine hundred ninety-nine billion, nine hundred eighty-two million, nine hundred ninety-nine thousand, nine hundred eighty-one".