8381020613 has 6 divisors (see below), whose sum is σ = 9749350566. Its totient is φ = 7183731912.

The previous prime is 8381020607. The next prime is 8381020633. The reversal of 8381020613 is 3160201838.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5177234209 + 3203786404 = 71953^2 + 56602^2 .

It is not a de Polignac number, because 8381020613 - 2⁸ = 8381020357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8381020613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8381020633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 85520570 + ... + 85520667.

It is an arithmetic number, because the mean of its divisors is an integer number (1624891761).

Almost surely, 2^8381020613 is an apocalyptic number.

It is an amenable number.

8381020613 is a deficient number, since it is larger than the sum of its proper divisors (1368329953).

8381020613 is a wasteful number, since it uses less digits than its factorization.

8381020613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171041251 (or 171041244 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 8381020613 is about 91547.9143017469. The cubic root of 8381020613 is about 2031.2605607113.

The spelling of 8381020613 in words is "eight billion, three hundred eighty-one million, twenty thousand, six hundred thirteen".