278334961 has 2 divisors, whose sum is σ = 278334962. Its totient is φ = 278334960.

The previous prime is 278334949. The next prime is 278335003. The reversal of 278334961 is 169433872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 270799936 + 7535025 = 16456^2 + 2745^2 .

It is a cyclic number.

It is not a de Polignac number, because 278334961 - 2⁹ = 278334449 is a prime.

It is not a weakly prime, because it can be changed into another prime (278331961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139167480 + 139167481.

It is an arithmetic number, because the mean of its divisors is an integer number (139167481).

Almost surely, 2^278334961 is an apocalyptic number.

It is an amenable number.

278334961 is a deficient number, since it is larger than the sum of its proper divisors (1).

278334961 is an equidigital number, since it uses as much as digits as its factorization.

278334961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The square root of 278334961 is about 16683.3737894947. The cubic root of 278334961 is about 652.9139085409.

The spelling of 278334961 in words is "two hundred seventy-eight million, three hundred thirty-four thousand, nine hundred sixty-one".