891983824009 has 4 divisors (see below), whose sum is σ = 892222773316. Its totient is φ = 891744874704.

The previous prime is 891983823977. The next prime is 891983824031. The reversal of 891983824009 is 900428389198.

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 720848544784 + 171135279225 = 849028^2 + 413685^2 .

It is a cyclic number.

It is not a de Polignac number, because 891983824009 - 2⁵ = 891983823977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891983824909) 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, 119469054 + ... + 119476519.

It is an arithmetic number, because the mean of its divisors is an integer number (223055693329).

Almost surely, 2^891983824009 is an apocalyptic number.

It is an amenable number.

891983824009 is a deficient number, since it is larger than the sum of its proper divisors (238949307).

891983824009 is a wasteful number, since it uses less digits than its factorization.

891983824009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238949306.

The product of its (nonzero) digits is 8957952, while the sum is 61.

The spelling of 891983824009 in words is "eight hundred ninety-one billion, nine hundred eighty-three million, eight hundred twenty-four thousand, nine".