1284478551 has 12 divisors (see below), whose sum is σ = 1857078912. Its totient is φ = 855524736.

The previous prime is 1284478543. The next prime is 1284478553. The reversal of 1284478551 is 1558744821.

1284478551 is a `hidden beast` number, since 1 + 28 + 4 + 4 + 78 + 551 = 666.

It is not a de Polignac number, because 1284478551 - 2³ = 1284478543 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1284478497 and 1284478506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1284478553) 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 in 11 ways as a sum of consecutive naturals, for example, 55866 + ... + 75431.

It is an arithmetic number, because the mean of its divisors is an integer number (154756576).

Almost surely, 2^1284478551 is an apocalyptic number.

1284478551 is a deficient number, since it is larger than the sum of its proper divisors (572600361).

1284478551 is a wasteful number, since it uses less digits than its factorization.

1284478551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132390 (or 132387 counting only the distinct ones).

The product of its digits is 358400, while the sum is 45.

The square root of 1284478551 is about 35839.6226403125. The cubic root of 1284478551 is about 1087.0318911220.

The spelling of 1284478551 in words is "one billion, two hundred eighty-four million, four hundred seventy-eight thousand, five hundred fifty-one".