281320313 has 2 divisors, whose sum is σ = 281320314. Its totient is φ = 281320312.

The previous prime is 281320309. The next prime is 281320339. The reversal of 281320313 is 313023182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197908624 + 83411689 = 14068^2 + 9133^2 .

It is a cyclic number.

It is not a de Polignac number, because 281320313 - 2² = 281320309 is a prime.

It is a super-2 number, since 2×281320313² = 158282237012835938, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (281320363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140660156 + 140660157.

It is an arithmetic number, because the mean of its divisors is an integer number (140660157).

Almost surely, 2^281320313 is an apocalyptic number.

It is an amenable number.

281320313 is a deficient number, since it is larger than the sum of its proper divisors (1).

281320313 is an equidigital number, since it uses as much as digits as its factorization.

281320313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 281320313 is about 16772.6060288794. The cubic root of 281320313 is about 655.2399431702.

Adding to 281320313 its reverse (313023182), we get a palindrome (594343495).

The spelling of 281320313 in words is "two hundred eighty-one million, three hundred twenty thousand, three hundred thirteen".