281560768129 has 9 divisors (see below), whose sum is σ = 282681097219. Its totient is φ = 280444867960.

The previous prime is 281560768109. The next prime is 281560768133. The reversal of 281560768129 is 921867065182.

It is a happy number.

The square root of 281560768129 is 530623.

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

It can be written as a sum of positive squares in only one way, i.e., 266395338225 + 15165429904 = 516135^2 + 123148^2 .

It is not a de Polignac number, because 281560768129 - 2⁷ = 281560768001 is a prime.

It is a super-3 number, since 3×281560768129³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 281560768129.

It is not an unprimeable number, because it can be changed into a prime (281560768109) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 155471634 + ... + 155473444.

Almost surely, 2^281560768129 is an apocalyptic number.

281560768129 is the 530623-rd square number.

281560768129 is the 265312-nd centered octagonal number.

It is an amenable number.

281560768129 is a deficient number, since it is larger than the sum of its proper divisors (1120329090).

281560768129 is an frugal number, since it uses more digits than its factorization.

281560768129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208 (or 2104 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 281560768129 in words is "two hundred eighty-one billion, five hundred sixty million, seven hundred sixty-eight thousand, one hundred twenty-nine".