280909540081 has 9 divisors (see below), whose sum is σ = 298415207649. Its totient is φ = 264376969344.

The previous prime is 280909540073. The next prime is 280909540111. The reversal of 280909540081 is 180045909082.

The square root of 280909540081 is 530009.

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 83631434481 + 197278105600 = 289191^2 + 444160^2 .

It is not a de Polignac number, because 280909540081 - 2³ = 280909540073 is a prime.

It is a super-2 number, since 2×280909540081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280909540001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8994565 + ... + 9025741.

Almost surely, 2^280909540081 is an apocalyptic number.

280909540081 is the 530009-th square number.

280909540081 is the 265005-th centered octagonal number.

It is an amenable number.

280909540081 is a deficient number, since it is larger than the sum of its proper divisors (17505667568).

280909540081 is an frugal number, since it uses more digits than its factorization.

280909540081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62388 (or 31194 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 280909540081 in words is "two hundred eighty billion, nine hundred nine million, five hundred forty thousand, eighty-one".