281068813 has 2 divisors, whose sum is σ = 281068814. Its totient is φ = 281068812.

The previous prime is 281068771. The next prime is 281068867. The reversal of 281068813 is 318860182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157703364 + 123365449 = 12558^2 + 11107^2 .

It is a cyclic number.

It is not a de Polignac number, because 281068813 - 2⁹ = 281068301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281068213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140534406 + 140534407.

It is an arithmetic number, because the mean of its divisors is an integer number (140534407).

Almost surely, 2^281068813 is an apocalyptic number.

It is an amenable number.

281068813 is a deficient number, since it is larger than the sum of its proper divisors (1).

281068813 is an equidigital number, since it uses as much as digits as its factorization.

281068813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 281068813 is about 16765.1070083075. The cubic root of 281068813 is about 655.0446237298.

The spelling of 281068813 in words is "two hundred eighty-one million, sixty-eight thousand, eight hundred thirteen".