8102613981 has 24 divisors (see below), whose sum is σ = 13709805984. Its totient is φ = 4209149280.

The previous prime is 8102613943. The next prime is 8102613989. The reversal of 8102613981 is 1893162018.

8102613981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8102613981 - 2¹³ = 8102605789 is a prime.

It is a super-2 number, since 2×8102613981² (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 (8102613989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2503830 + ... + 2507063.

It is an arithmetic number, because the mean of its divisors is an integer number (571241916).

Almost surely, 2^8102613981 is an apocalyptic number.

It is an amenable number.

8102613981 is a deficient number, since it is larger than the sum of its proper divisors (5607192003).

8102613981 is a wasteful number, since it uses less digits than its factorization.

8102613981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5010921 (or 5010914 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 8102613981 is about 90014.5209452342. The cubic root of 8102613981 is about 2008.5148621982.

Adding to 8102613981 its reverse (1893162018), we get a palindrome (9995775999).

The spelling of 8102613981 in words is "eight billion, one hundred two million, six hundred thirteen thousand, nine hundred eighty-one".