8216097981 has 48 divisors (see below), whose sum is σ = 13781779200. Its totient is φ = 4315393152.

The previous prime is 8216097979. The next prime is 8216097997. The reversal of 8216097981 is 1897906128.

It is not a de Polignac number, because 8216097981 - 2¹ = 8216097979 is a prime.

It is a super-2 number, since 2×8216097981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8216097961) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 447735 + ... + 465723.

It is an arithmetic number, because the mean of its divisors is an integer number (287120400).

Almost surely, 2^8216097981 is an apocalyptic number.

It is an amenable number.

8216097981 is a deficient number, since it is larger than the sum of its proper divisors (5565681219).

8216097981 is a wasteful number, since it uses less digits than its factorization.

8216097981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18258 (or 18251 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 51.

The square root of 8216097981 is about 90642.6940299107. The cubic root of 8216097981 is about 2017.8484084176.

The spelling of 8216097981 in words is "eight billion, two hundred sixteen million, ninety-seven thousand, nine hundred eighty-one".