1284500009 has 4 divisors (see below), whose sum is σ = 1383307716. Its totient is φ = 1185692304.

The previous prime is 1284499981. The next prime is 1284500023. The reversal of 1284500009 is 9000054821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9000054821 = 8111 ⋅1109611.

It can be written as a sum of positive squares in 2 ways, for example, as 59290000 + 1225210009 = 7700^2 + 35003^2 .

It is a cyclic number.

It is not a de Polignac number, because 1284500009 - 2¹² = 1284495913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1284500069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49403834 + ... + 49403859.

It is an arithmetic number, because the mean of its divisors is an integer number (345826929).

Almost surely, 2^1284500009 is an apocalyptic number.

It is an amenable number.

1284500009 is a deficient number, since it is larger than the sum of its proper divisors (98807707).

1284500009 is an equidigital number, since it uses as much as digits as its factorization.

1284500009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98807706.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1284500009 is about 35839.9220004732. The cubic root of 1284500009 is about 1087.0379442659.

The spelling of 1284500009 in words is "one billion, two hundred eighty-four million, five hundred thousand, nine".