281893243 has 2 divisors, whose sum is σ = 281893244. Its totient is φ = 281893242.

The previous prime is 281893237. The next prime is 281893279. The reversal of 281893243 is 342398182.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-281893243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 281893196 and 281893205.

It is not a weakly prime, because it can be changed into another prime (281893043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140946621 + 140946622.

It is an arithmetic number, because the mean of its divisors is an integer number (140946622).

Almost surely, 2^281893243 is an apocalyptic number.

281893243 is a deficient number, since it is larger than the sum of its proper divisors (1).

281893243 is an equidigital number, since it uses as much as digits as its factorization.

281893243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 281893243 is about 16789.6766794361. The cubic root of 281893243 is about 655.6844567055.

The spelling of 281893243 in words is "two hundred eighty-one million, eight hundred ninety-three thousand, two hundred forty-three".