280931121 has 27 divisors (see below), whose sum is σ = 419833323. Its totient is φ = 181018800.

The previous prime is 280931113. The next prime is 280931143. The reversal of 280931121 is 121139082.

The square root of 280931121 is 16761.

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., 251381025 + 29550096 = 15855^2 + 5436^2 .

It is not a de Polignac number, because 280931121 - 2³ = 280931113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (280931191) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1860396 + ... + 1860546.

Almost surely, 2^280931121 is an apocalyptic number.

280931121 is the 16761-st square number.

280931121 is the 8381-st centered octagonal number.

It is an amenable number.

280931121 is a deficient number, since it is larger than the sum of its proper divisors (138902202).

280931121 is an equidigital number, since it uses as much as digits as its factorization.

280931121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The cubic root of 280931121 is about 654.9376402765.

It can be divided in two parts, 2809 and 31121, that added together give a triangular number (33930 = T₂₆₀).

The spelling of 280931121 in words is "two hundred eighty million, nine hundred thirty-one thousand, one hundred twenty-one".