280521323 has 4 divisors (see below), whose sum is σ = 281588208. Its totient is φ = 279454440.

The previous prime is 280521229. The next prime is 280521331. The reversal of 280521323 is 323125082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 280521323 - 2¹⁶ = 280455787 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 280521292 and 280521301.

It is not an unprimeable number, because it can be changed into a prime (280521343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533048 + ... + 533573.

It is an arithmetic number, because the mean of its divisors is an integer number (70397052).

Almost surely, 2^280521323 is an apocalyptic number.

280521323 is a deficient number, since it is larger than the sum of its proper divisors (1066885).

280521323 is a wasteful number, since it uses less digits than its factorization.

280521323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066884.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 280521323 is about 16748.7707907177. The cubic root of 280521323 is about 654.6190298612.

The spelling of 280521323 in words is "two hundred eighty million, five hundred twenty-one thousand, three hundred twenty-three".