280235231 has 4 divisors (see below), whose sum is σ = 283124352. Its totient is φ = 277346112.

The previous prime is 280235227. The next prime is 280235233. The reversal of 280235231 is 132532082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132532082 = 2 ⋅66266041.

It is a cyclic number.

It is not a de Polignac number, because 280235231 - 2² = 280235227 is a prime.

It is a super-2 number, since 2×280235231² = 157063569387246722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 280235231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280235233) 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, 1444415 + ... + 1444608.

It is an arithmetic number, because the mean of its divisors is an integer number (70781088).

Almost surely, 2^280235231 is an apocalyptic number.

280235231 is a deficient number, since it is larger than the sum of its proper divisors (2889121).

280235231 is an equidigital number, since it uses as much as digits as its factorization.

280235231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2889120.

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

The square root of 280235231 is about 16740.2279255690. The cubic root of 280235231 is about 654.3964146148.

The spelling of 280235231 in words is "two hundred eighty million, two hundred thirty-five thousand, two hundred thirty-one".