278046961 has 2 divisors, whose sum is σ = 278046962. Its totient is φ = 278046960.

The previous prime is 278046943. The next prime is 278046997. The reversal of 278046961 is 169640872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 256480225 + 21566736 = 16015^2 + 4644^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278046961 is a prime.

It is a super-2 number, since 2×278046961² = 154620225042671042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (278046061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139023480 + 139023481.

It is an arithmetic number, because the mean of its divisors is an integer number (139023481).

Almost surely, 2^278046961 is an apocalyptic number.

It is an amenable number.

278046961 is a deficient number, since it is larger than the sum of its proper divisors (1).

278046961 is an equidigital number, since it uses as much as digits as its factorization.

278046961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 278046961 is about 16674.7402078713. The cubic root of 278046961 is about 652.6886354879.

The spelling of 278046961 in words is "two hundred seventy-eight million, forty-six thousand, nine hundred sixty-one".