278742011 has 2 divisors, whose sum is σ = 278742012. Its totient is φ = 278742010.

The previous prime is 278741963. The next prime is 278742041. The reversal of 278742011 is 110247872.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278742011 - 2¹⁸ = 278479867 is a prime.

It is not a weakly prime, because it can be changed into another prime (278742041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139371005 + 139371006.

It is an arithmetic number, because the mean of its divisors is an integer number (139371006).

Almost surely, 2^278742011 is an apocalyptic number.

278742011 is a deficient number, since it is larger than the sum of its proper divisors (1).

278742011 is an equidigital number, since it uses as much as digits as its factorization.

278742011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 278742011 is about 16695.5686036744. The cubic root of 278742011 is about 653.2320374041.

Adding to 278742011 its reverse (110247872), we get a palindrome (388989883).

The spelling of 278742011 in words is "two hundred seventy-eight million, seven hundred forty-two thousand, eleven".