278008231 has 2 divisors, whose sum is σ = 278008232. Its totient is φ = 278008230.

The previous prime is 278008219. The next prime is 278008261. The reversal of 278008231 is 132800872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278008231 - 2¹⁵ = 277975463 is a prime.

It is a super-2 number, since 2×278008231² = 154577153007498722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 278008193 and 278008202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278008261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139004115 + 139004116.

It is an arithmetic number, because the mean of its divisors is an integer number (139004116).

Almost surely, 2^278008231 is an apocalyptic number.

278008231 is a deficient number, since it is larger than the sum of its proper divisors (1).

278008231 is an equidigital number, since it uses as much as digits as its factorization.

278008231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 278008231 is about 16673.5788299933. The cubic root of 278008231 is about 652.6583290911.

The spelling of 278008231 in words is "two hundred seventy-eight million, eight thousand, two hundred thirty-one".