281374213 has 2 divisors, whose sum is σ = 281374214. Its totient is φ = 281374212.

The previous prime is 281374201. The next prime is 281374229. The reversal of 281374213 is 312473182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 277622244 + 3751969 = 16662^2 + 1937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-281374213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281374253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140687106 + 140687107.

It is an arithmetic number, because the mean of its divisors is an integer number (140687107).

Almost surely, 2^281374213 is an apocalyptic number.

It is an amenable number.

281374213 is a deficient number, since it is larger than the sum of its proper divisors (1).

281374213 is an equidigital number, since it uses as much as digits as its factorization.

281374213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 281374213 is about 16774.2127386056. The cubic root of 281374213 is about 655.2817877343.

The spelling of 281374213 in words is "two hundred eighty-one million, three hundred seventy-four thousand, two hundred thirteen".