8305491981 has 16 divisors (see below), whose sum is σ = 11573225856. Its totient is φ = 5288116416.

The previous prime is 8305491949. The next prime is 8305492003. The reversal of 8305491981 is 1891945038.

It is not a de Polignac number, because 8305491981 - 2⁵ = 8305491949 is a prime.

It is a super-2 number, since 2×8305491981² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8305491981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8305491281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47110 + ... + 137223.

It is an arithmetic number, because the mean of its divisors is an integer number (723326616).

Almost surely, 2^8305491981 is an apocalyptic number.

It is an amenable number.

8305491981 is a deficient number, since it is larger than the sum of its proper divisors (3267733875).

8305491981 is a wasteful number, since it uses less digits than its factorization.

8305491981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185012.

The product of its (nonzero) digits is 311040, while the sum is 48.

The square root of 8305491981 is about 91134.4719686245. The cubic root of 8305491981 is about 2025.1403230302.

The spelling of 8305491981 in words is "eight billion, three hundred five million, four hundred ninety-one thousand, nine hundred eighty-one".