8889201981 has 32 divisors (see below), whose sum is σ = 14829834240. Its totient is φ = 5213602800.

The previous prime is 8889201967. The next prime is 8889201983. The reversal of 8889201981 is 1891029888.

It is not a de Polignac number, because 8889201981 - 2⁵ = 8889201949 is a prime.

It is a super-2 number, since 2×8889201981² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8889201983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 473535 + ... + 491948.

It is an arithmetic number, because the mean of its divisors is an integer number (463432320).

Almost surely, 2^8889201981 is an apocalyptic number.

It is an amenable number.

8889201981 is a deficient number, since it is larger than the sum of its proper divisors (5940632259).

8889201981 is a wasteful number, since it uses less digits than its factorization.

8889201981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965534 (or 965528 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 54.

The square root of 8889201981 is about 94282.5645652472. The cubic root of 8889201981 is about 2071.5126582666.

The spelling of 8889201981 in words is "eight billion, eight hundred eighty-nine million, two hundred one thousand, nine hundred eighty-one".