278011271 has 2 divisors, whose sum is σ = 278011272. Its totient is φ = 278011270.

The previous prime is 278011177. The next prime is 278011273. The reversal of 278011271 is 172110872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278011271 - 2¹⁰ = 278010247 is a prime.

It is a Sophie Germain prime.

Together with 278011273, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278011273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139005635 + 139005636.

It is an arithmetic number, because the mean of its divisors is an integer number (139005636).

Almost surely, 2^278011271 is an apocalyptic number.

278011271 is a deficient number, since it is larger than the sum of its proper divisors (1).

278011271 is an equidigital number, since it uses as much as digits as its factorization.

278011271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 29.

The square root of 278011271 is about 16673.6699919364. The cubic root of 278011271 is about 652.6607080063.

The spelling of 278011271 in words is "two hundred seventy-eight million, eleven thousand, two hundred seventy-one".