1378161271 has 2 divisors, whose sum is σ = 1378161272. Its totient is φ = 1378161270.

The previous prime is 1378161263. The next prime is 1378161293. The reversal of 1378161271 is 1721618731.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1378161271 - 2³ = 1378161263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1378161271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1378161571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689080635 + 689080636.

It is an arithmetic number, because the mean of its divisors is an integer number (689080636).

Almost surely, 2^1378161271 is an apocalyptic number.

1378161271 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378161271 is an equidigital number, since it uses as much as digits as its factorization.

1378161271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 37.

The square root of 1378161271 is about 37123.5945323187. The cubic root of 1378161271 is about 1112.8415874182.

The spelling of 1378161271 in words is "one billion, three hundred seventy-eight million, one hundred sixty-one thousand, two hundred seventy-one".