1281670005 has 64 divisors (see below), whose sum is σ = 2567448576. Its totient is φ = 530400000.

The previous prime is 1281669959. The next prime is 1281670007. The reversal of 1281670005 is 5000761821.

It is not a de Polignac number, because 1281670005 - 2¹⁴ = 1281653621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281670007) 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 63 ways as a sum of consecutive naturals, for example, 287695 + ... + 292115.

It is an arithmetic number, because the mean of its divisors is an integer number (40116384).

Almost surely, 2^1281670005 is an apocalyptic number.

1281670005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1281670005 is an abundant number, since it is smaller than the sum of its proper divisors (1285778571).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1281670005 is a wasteful number, since it uses less digits than its factorization.

1281670005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4698.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 1281670005 is about 35800.4190617931. The cubic root of 1281670005 is about 1086.2390384079.

The spelling of 1281670005 in words is "one billion, two hundred eighty-one million, six hundred seventy thousand, five".