1285333381 has 2 divisors, whose sum is σ = 1285333382. Its totient is φ = 1285333380.

The previous prime is 1285333367. The next prime is 1285333453. The reversal of 1285333381 is 1833335821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 847101025 + 438232356 = 29105^2 + 20934^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1285333381 is a prime.

It is a super-2 number, since 2×1285333381² = 3304163800625782322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1285333381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285333481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642666690 + 642666691.

It is an arithmetic number, because the mean of its divisors is an integer number (642666691).

Almost surely, 2^1285333381 is an apocalyptic number.

It is an amenable number.

1285333381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285333381 is an equidigital number, since it uses as much as digits as its factorization.

1285333381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 37.

The square root of 1285333381 is about 35851.5464241084. The cubic root of 1285333381 is about 1087.2729802423.

The spelling of 1285333381 in words is "one billion, two hundred eighty-five million, three hundred thirty-three thousand, three hundred eighty-one".