281494974721 has 9 divisors (see below), whose sum is σ = 282379000449. Its totient is φ = 280613712900.

The previous prime is 281494974701. The next prime is 281494974749. The reversal of 281494974721 is 127479494182.

The square root of 281494974721 is 530561.

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

It is not a de Polignac number, because 281494974721 - 2²³ = 281486586113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281494974701) 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 8 ways as a sum of consecutive naturals, for example, 228671176 + ... + 228672406.

Almost surely, 2^281494974721 is an apocalyptic number.

281494974721 is the 530561-st square number.

281494974721 is the 265281-st centered octagonal number.

It is an amenable number.

281494974721 is a deficient number, since it is larger than the sum of its proper divisors (884025728).

281494974721 is an frugal number, since it uses more digits than its factorization.

281494974721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3324 (or 1662 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 58.

The spelling of 281494974721 in words is "two hundred eighty-one billion, four hundred ninety-four million, nine hundred seventy-four thousand, seven hundred twenty-one".