8320140281 has 4 divisors (see below), whose sum is σ = 8607041700. Its totient is φ = 8033238864.

The previous prime is 8320140277. The next prime is 8320140307. The reversal of 8320140281 is 1820410238.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2034821881 + 6285318400 = 45109^2 + 79280^2 .

It is a cyclic number.

It is not a de Polignac number, because 8320140281 - 2² = 8320140277 is a prime.

It is a super-2 number, since 2×8320140281² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 286901389 = 8320140281 / (8 + 3 + 2 + 0 + 1 + 4 + 0 + 2 + 8 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8320140211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143450666 + ... + 143450723.

It is an arithmetic number, because the mean of its divisors is an integer number (2151760425).

Almost surely, 2^8320140281 is an apocalyptic number.

8320140281 is the 40793-rd centered decagonal number.

It is an amenable number.

8320140281 is a deficient number, since it is larger than the sum of its proper divisors (286901419).

8320140281 is a wasteful number, since it uses less digits than its factorization.

8320140281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286901418.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 8320140281 is about 91214.8029707898. The cubic root of 8320140281 is about 2026.3301959589.

The spelling of 8320140281 in words is "eight billion, three hundred twenty million, one hundred forty thousand, two hundred eighty-one".