281215093 has 2 divisors, whose sum is σ = 281215094. Its totient is φ = 281215092.

The previous prime is 281215087. The next prime is 281215097. The reversal of 281215093 is 390512182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 274465489 + 6749604 = 16567^2 + 2598^2 .

It is a cyclic number.

It is not a de Polignac number, because 281215093 - 2¹⁷ = 281084021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281215097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140607546 + 140607547.

It is an arithmetic number, because the mean of its divisors is an integer number (140607547).

Almost surely, 2^281215093 is an apocalyptic number.

It is an amenable number.

281215093 is a deficient number, since it is larger than the sum of its proper divisors (1).

281215093 is an equidigital number, since it uses as much as digits as its factorization.

281215093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 281215093 is about 16769.4690732891. The cubic root of 281215093 is about 655.1582415878.

It can be divided in two parts, 28 and 1215093, that added together give a palindrome (1215121).

The spelling of 281215093 in words is "two hundred eighty-one million, two hundred fifteen thousand, ninety-three".