281968297 has 8 divisors (see below), whose sum is σ = 303855944. Its totient is φ = 260108928.

The previous prime is 281968283. The next prime is 281968327. The reversal of 281968297 is 792869182.

It can be written as a sum of positive squares in 4 ways, for example, as 3111696 + 278856601 = 1764^2 + 16699^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 281968297 - 2¹¹ = 281966249 is a prime.

It is a super-2 number, since 2×281968297² = 159012241026160418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281968397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16603 + ... + 28975.

It is an arithmetic number, because the mean of its divisors is an integer number (37981993).

Almost surely, 2^281968297 is an apocalyptic number.

It is an amenable number.

281968297 is a deficient number, since it is larger than the sum of its proper divisors (21887647).

281968297 is a wasteful number, since it uses less digits than its factorization.

281968297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14139.

The product of its digits is 870912, while the sum is 52.

The square root of 281968297 is about 16791.9116541268. The cubic root of 281968297 is about 655.7426434784.

The spelling of 281968297 in words is "two hundred eighty-one million, nine hundred sixty-eight thousand, two hundred ninety-seven".