989992671001 has 4 divisors (see below), whose sum is σ = 989994702004. Its totient is φ = 989990640000.

The previous prime is 989992670993. The next prime is 989992671029. The reversal of 989992671001 is 100176299989.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 974129520400 + 15863150601 = 986980^2 + 125949^2 .

It is a 3-Lehmer number, since φ(989992671001) divides (989992671001-1)³.

It is a cyclic number.

It is not a de Polignac number, because 989992671001 - 2³ = 989992670993 is a prime.

It is a deceptive number, since it divides R_989992671000.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989992671301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203101 + ... + 1421701.

It is an arithmetic number, because the mean of its divisors is an integer number (247498675501).

It is a Poulet number, since it divides 2^989992671000-1.

Almost surely, 2^989992671001 is an apocalyptic number.

989992671001 is the 812401-st pentagonal number.

It is an amenable number.

989992671001 is a deficient number, since it is larger than the sum of its proper divisors (2031003).

989992671001 is a wasteful number, since it uses less digits than its factorization.

989992671001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2031002.

The product of its (nonzero) digits is 4408992, while the sum is 61.

The spelling of 989992671001 in words is "nine hundred eighty-nine billion, nine hundred ninety-two million, six hundred seventy-one thousand, one".