281630961 has 12 divisors (see below), whose sum is σ = 413469940. Its totient is φ = 184675680.

The previous prime is 281630957. The next prime is 281630981. The reversal of 281630961 is 169036182.

It can be written as a sum of positive squares in 2 ways, for example, as 149817600 + 131813361 = 12240^2 + 11481^2 .

It is not a de Polignac number, because 281630961 - 2² = 281630957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281630941) 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 in 11 ways as a sum of consecutive naturals, for example, 255946 + ... + 257043.

Almost surely, 2^281630961 is an apocalyptic number.

It is an amenable number.

281630961 is a deficient number, since it is larger than the sum of its proper divisors (131838979).

281630961 is a wasteful number, since it uses less digits than its factorization.

281630961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513056 (or 513053 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 281630961 is about 16781.8640502180. The cubic root of 281630961 is about 655.4810373860.

The spelling of 281630961 in words is "two hundred eighty-one million, six hundred thirty thousand, nine hundred sixty-one".