280261231 has 2 divisors, whose sum is σ = 280261232. Its totient is φ = 280261230.

The previous prime is 280261213. The next prime is 280261253. The reversal of 280261231 is 132162082.

Together with previous prime (280261213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280261231 is a prime.

It is a super-2 number, since 2×280261231² = 157092715203270722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 280261196 and 280261205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280262231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140130615 + 140130616.

It is an arithmetic number, because the mean of its divisors is an integer number (140130616).

Almost surely, 2^280261231 is an apocalyptic number.

280261231 is a deficient number, since it is larger than the sum of its proper divisors (1).

280261231 is an equidigital number, since it uses as much as digits as its factorization.

280261231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 280261231 is about 16741.0044800185. The cubic root of 280261231 is about 654.4166521138.

The spelling of 280261231 in words is "two hundred eighty million, two hundred sixty-one thousand, two hundred thirty-one".