275261281 has 9 divisors (see below), whose sum is σ = 282041491.
Its totient is φ = 268641472.
The previous prime is 275261279. The next prime is 275261293. The reversal of 275261281 is 182162572.
It is a happy number.
The square root of 275261281 is 16591.
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., 111830625 + 163430656 = 10575^2 + 12784^2
It is not a de Polignac number, because 275261281 - 21 = 275261279 is a prime.
It is a super-2 number, since 2×2752612812 = 151537545635521922, which contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (275261221) 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 8 ways as a sum of consecutive naturals, for example, 779601 + ... + 779953.
Almost surely, 2275261281 is an apocalyptic number.
275261281 is the 16591-st square number.
275261281 is the 8296-th centered octagonal number.
It is an amenable number.
275261281 is a deficient number, since it is larger than the sum of its proper divisors (6780210).
275261281 is an frugal number, since it uses more digits than its factorization.
275261281 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 800 (or 400 counting only the distinct ones).
The product of its digits is 13440, while the sum is 34.
The cubic root of 275261281 is about 650.5016096489.
The spelling of 275261281 in words is "two hundred seventy-five million, two hundred sixty-one thousand, two hundred eighty-one".