1284739381 has 2 divisors, whose sum is σ = 1284739382. Its totient is φ = 1284739380.

The previous prime is 1284739367. The next prime is 1284739403. The reversal of 1284739381 is 1839374821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1050343281 + 234396100 = 32409^2 + 15310^2 .

It is a cyclic number.

It is not a de Polignac number, because 1284739381 - 2²⁹ = 747868469 is a prime.

It is a super-2 number, since 2×1284739381² = 3301110554184526322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1284739301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642369690 + 642369691.

It is an arithmetic number, because the mean of its divisors is an integer number (642369691).

Almost surely, 2^1284739381 is an apocalyptic number.

It is an amenable number.

1284739381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1284739381 is an equidigital number, since it uses as much as digits as its factorization.

1284739381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 46.

The square root of 1284739381 is about 35843.2613052998. The cubic root of 1284739381 is about 1087.1054647753.

The spelling of 1284739381 in words is "one billion, two hundred eighty-four million, seven hundred thirty-nine thousand, three hundred eighty-one".