89551163921 has 4 divisors (see below), whose sum is σ = 89551819812. Its totient is φ = 89550508032.

The previous prime is 89551163881. The next prime is 89551163953. The reversal of 89551163921 is 12936115598.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 43825329025 + 45725834896 = 209345^2 + 213836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89551163921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 89551163921.

It is not an unprimeable number, because it can be changed into a prime (89551163621) 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, 37256 + ... + 424841.

It is an arithmetic number, because the mean of its divisors is an integer number (22387954953).

Almost surely, 2^89551163921 is an apocalyptic number.

It is an amenable number.

89551163921 is a deficient number, since it is larger than the sum of its proper divisors (655891).

89551163921 is a wasteful number, since it uses less digits than its factorization.

89551163921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655890.

The product of its digits is 583200, while the sum is 50.

The spelling of 89551163921 in words is "eighty-nine billion, five hundred fifty-one million, one hundred sixty-three thousand, nine hundred twenty-one".