278661283 has 2 divisors, whose sum is σ = 278661284. Its totient is φ = 278661282.

The previous prime is 278661269. The next prime is 278661329. The reversal of 278661283 is 382166872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278661283 - 2¹³ = 278653091 is a prime.

It is a super-2 number, since 2×278661283² = 155304221286412178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (278661233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139330641 + 139330642.

It is an arithmetic number, because the mean of its divisors is an integer number (139330642).

Almost surely, 2^278661283 is an apocalyptic number.

278661283 is a deficient number, since it is larger than the sum of its proper divisors (1).

278661283 is an equidigital number, since it uses as much as digits as its factorization.

278661283 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 43.

The square root of 278661283 is about 16693.1507810838. The cubic root of 278661283 is about 653.1689692795.

The spelling of 278661283 in words is "two hundred seventy-eight million, six hundred sixty-one thousand, two hundred eighty-three".