1391144281 has 2 divisors, whose sum is σ = 1391144282. Its totient is φ = 1391144280.

The previous prime is 1391144273. The next prime is 1391144327. The reversal of 1391144281 is 1824411931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 956046400 + 435097881 = 30920^2 + 20859^2 .

It is an emirp because it is prime and its reverse (1824411931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1391144281 - 2³ = 1391144273 is a prime.

It is a super-2 number, since 2×1391144281² = 3870564821118013922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1391144231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695572140 + 695572141.

It is an arithmetic number, because the mean of its divisors is an integer number (695572141).

Almost surely, 2^1391144281 is an apocalyptic number.

It is an amenable number.

1391144281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391144281 is an equidigital number, since it uses as much as digits as its factorization.

1391144281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 34.

The square root of 1391144281 is about 37298.0466110492. The cubic root of 1391144281 is about 1116.3251903770.

The spelling of 1391144281 in words is "one billion, three hundred ninety-one million, one hundred forty-four thousand, two hundred eighty-one".