8281813 has 2 divisors, whose sum is σ = 8281814. Its totient is φ = 8281812.

The previous prime is 8281811. The next prime is 8281831. The reversal of 8281813 is 3181828.

Together with next prime (8281831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5049009 + 3232804 = 2247^2 + 1798^2 .

It is a cyclic number.

It is not a de Polignac number, because 8281813 - 2¹ = 8281811 is a prime.

Together with 8281811, it forms a pair of twin primes.

It is equal to p₅₅₇₄₆₄ and since 8281813 and 557464 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8281811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4140906 + 4140907.

It is an arithmetic number, because the mean of its divisors is an integer number (4140907).

Almost surely, 2^8281813 is an apocalyptic number.

It is an amenable number.

8281813 is a deficient number, since it is larger than the sum of its proper divisors (1).

8281813 is an equidigital number, since it uses as much as digits as its factorization.

8281813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072, while the sum is 31.

The square root of 8281813 is about 2877.8139272719. The cubic root of 8281813 is about 202.3213930900.

The spelling of 8281813 in words is "eight million, two hundred eighty-one thousand, eight hundred thirteen".