281239201 has 2 divisors, whose sum is σ = 281239202. Its totient is φ = 281239200.

The previous prime is 281239169. The next prime is 281239229. The reversal of 281239201 is 102932182.

It is an a-pointer prime, because the next prime (281239229) can be obtained adding 281239201 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219632400 + 61606801 = 14820^2 + 7849^2 .

It is a cyclic number.

It is not a de Polignac number, because 281239201 - 2⁵ = 281239169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 281239201.

It is not a weakly prime, because it can be changed into another prime (281239241) 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, 140619600 + 140619601.

It is an arithmetic number, because the mean of its divisors is an integer number (140619601).

Almost surely, 2^281239201 is an apocalyptic number.

It is an amenable number.

281239201 is a deficient number, since it is larger than the sum of its proper divisors (1).

281239201 is an equidigital number, since it uses as much as digits as its factorization.

281239201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 281239201 is about 16770.1878641833. The cubic root of 281239201 is about 655.1769628490.

The spelling of 281239201 in words is "two hundred eighty-one million, two hundred thirty-nine thousand, two hundred one".