280616243 has 4 divisors (see below), whose sum is σ = 281734488. Its totient is φ = 279498000.

The previous prime is 280616221. The next prime is 280616257. The reversal of 280616243 is 342616082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342616082 = 2 ⋅171308041.

It is a cyclic number.

It is not a de Polignac number, because 280616243 - 2¹⁰ = 280615219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280616293) 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, 558746 + ... + 559247.

It is an arithmetic number, because the mean of its divisors is an integer number (70433622).

Almost surely, 2^280616243 is an apocalyptic number.

280616243 is a deficient number, since it is larger than the sum of its proper divisors (1118245).

280616243 is a wasteful number, since it uses less digits than its factorization.

280616243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118244.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 280616243 is about 16751.6041918379. The cubic root of 280616243 is about 654.6928560153.

The spelling of 280616243 in words is "two hundred eighty million, six hundred sixteen thousand, two hundred forty-three".