281289097 has 4 divisors (see below), whose sum is σ = 281440836. Its totient is φ = 281137360.

The previous prime is 281289079. The next prime is 281289143. The reversal of 281289097 is 790982182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121418361 + 159870736 = 11019^2 + 12644^2 .

It is a cyclic number.

It is not a de Polignac number, because 281289097 - 2¹⁵ = 281256329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281289037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73054 + ... + 76807.

It is an arithmetic number, because the mean of its divisors is an integer number (70360209).

Almost surely, 2^281289097 is an apocalyptic number.

It is an amenable number.

281289097 is a deficient number, since it is larger than the sum of its proper divisors (151739).

281289097 is a wasteful number, since it uses less digits than its factorization.

281289097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151738.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 281289097 is about 16771.6754380712. The cubic root of 281289097 is about 655.2157065904.

The spelling of 281289097 in words is "two hundred eighty-one million, two hundred eighty-nine thousand, ninety-seven".