281630814721 has 81 divisors (see below), whose sum is σ = 332532385353. Its totient is φ = 238427953920.

The previous prime is 281630814697. The next prime is 281630814737. The reversal of 281630814721 is 127418036182.

The square root of 281630814721 is 530689.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 70564078321 + 211066736400 = 265639^2 + 459420^2 .

It is not a de Polignac number, because 281630814721 - 2²⁷ = 281496596993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281630814781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 5313788931 + ... + 5313788983.

Almost surely, 2^281630814721 is an apocalyptic number.

281630814721 is the 530689-th square number.

281630814721 is the 265345-th centered octagonal number.

It is an amenable number.

281630814721 is a deficient number, since it is larger than the sum of its proper divisors (50901570632).

281630814721 is an equidigital number, since it uses as much as digits as its factorization.

281630814721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 43.

The spelling of 281630814721 in words is "two hundred eighty-one billion, six hundred thirty million, eight hundred fourteen thousand, seven hundred twenty-one".