891996489122 has 18 divisors (see below), whose sum is σ = 1412162042193. Its totient is φ = 422512631784.

The previous prime is 891996489113. The next prime is 891996489149. The reversal of 891996489122 is 221984699198.

891996489122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 813786214201 + 78210274921 = 902101^2 + 279661^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=667831.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 25360004 + ... + 25395152.

Almost surely, 2^891996489122 is an apocalyptic number.

891996489122 is a deficient number, since it is larger than the sum of its proper divisors (520165553071).

891996489122 is an frugal number, since it uses more digits than its factorization.

891996489122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70338 (or 35170 counting only the distinct ones).

The product of its digits is 40310784, while the sum is 68.

The spelling of 891996489122 in words is "eight hundred ninety-one billion, nine hundred ninety-six million, four hundred eighty-nine thousand, one hundred twenty-two".