1284421851 has 12 divisors (see below), whose sum is σ = 1856546328. Its totient is φ = 855694944.

The previous prime is 1284421849. The next prime is 1284421877. The reversal of 1284421851 is 1581244821.

It is not a de Polignac number, because 1284421851 - 2¹ = 1284421849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1284425851) 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, 34770 + ... + 61463.

It is an arithmetic number, because the mean of its divisors is an integer number (154712194).

Almost surely, 2^1284421851 is an apocalyptic number.

1284421851 is a deficient number, since it is larger than the sum of its proper divisors (572124477).

1284421851 is a wasteful number, since it uses less digits than its factorization.

1284421851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97722 (or 97719 counting only the distinct ones).

The product of its digits is 20480, while the sum is 36.

The square root of 1284421851 is about 35838.8316076292. The cubic root of 1284421851 is about 1087.0158961449.

The spelling of 1284421851 in words is "one billion, two hundred eighty-four million, four hundred twenty-one thousand, eight hundred fifty-one".