278262493 has 2 divisors, whose sum is σ = 278262494. Its totient is φ = 278262492.

The previous prime is 278262473. The next prime is 278262521. The reversal of 278262493 is 394262872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156425049 + 121837444 = 12507^2 + 11038^2 .

It is a cyclic number.

It is not a de Polignac number, because 278262493 - 2¹⁷ = 278131421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278262473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139131246 + 139131247.

It is an arithmetic number, because the mean of its divisors is an integer number (139131247).

Almost surely, 2^278262493 is an apocalyptic number.

It is an amenable number.

278262493 is a deficient number, since it is larger than the sum of its proper divisors (1).

278262493 is an equidigital number, since it uses as much as digits as its factorization.

278262493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 43.

The square root of 278262493 is about 16681.2017852432. The cubic root of 278262493 is about 652.8572388458.

The spelling of 278262493 in words is "two hundred seventy-eight million, two hundred sixty-two thousand, four hundred ninety-three".