278196553 has 2 divisors, whose sum is σ = 278196554. Its totient is φ = 278196552.

The previous prime is 278196473. The next prime is 278196587. The reversal of 278196553 is 355691872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 274498624 + 3697929 = 16568^2 + 1923^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278196553 is a prime.

It is not a weakly prime, because it can be changed into another prime (278196593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139098276 + 139098277.

It is an arithmetic number, because the mean of its divisors is an integer number (139098277).

Almost surely, 2^278196553 is an apocalyptic number.

It is an amenable number.

278196553 is a deficient number, since it is larger than the sum of its proper divisors (1).

278196553 is an equidigital number, since it uses as much as digits as its factorization.

278196553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 46.

The square root of 278196553 is about 16679.2251918367. The cubic root of 278196553 is about 652.8056654714.

The spelling of 278196553 in words is "two hundred seventy-eight million, one hundred ninety-six thousand, five hundred fifty-three".