281940653 has 2 divisors, whose sum is σ = 281940654. Its totient is φ = 281940652.

The previous prime is 281940643. The next prime is 281940667. The reversal of 281940653 is 356049182.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 280294564 + 1646089 = 16742^2 + 1283^2 .

It is a cyclic number.

It is not a de Polignac number, because 281940653 - 2²⁸ = 13505197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281940643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140970326 + 140970327.

It is an arithmetic number, because the mean of its divisors is an integer number (140970327).

Almost surely, 2^281940653 is an apocalyptic number.

It is an amenable number.

281940653 is a deficient number, since it is larger than the sum of its proper divisors (1).

281940653 is an equidigital number, since it uses as much as digits as its factorization.

281940653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 281940653 is about 16791.0884995583. The cubic root of 281940653 is about 655.7212132416.

The spelling of 281940653 in words is "two hundred eighty-one million, nine hundred forty thousand, six hundred fifty-three".