1280132305 has 4 divisors (see below), whose sum is σ = 1536158772. Its totient is φ = 1024105840.

The previous prime is 1280132303. The next prime is 1280132309. The reversal of 1280132305 is 5032310821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 824608656 + 455523649 = 28716^2 + 21343^2 .

It is not a de Polignac number, because 1280132305 - 2¹ = 1280132303 is a prime.

It is a super-2 number, since 2×1280132305² = 3277477436609226050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1280132305.

It is not an unprimeable number, because it can be changed into a prime (1280132303) 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 in 3 ways as a sum of consecutive naturals, for example, 128013226 + ... + 128013235.

It is an arithmetic number, because the mean of its divisors is an integer number (384039693).

Almost surely, 2^1280132305 is an apocalyptic number.

It is an amenable number.

1280132305 is a deficient number, since it is larger than the sum of its proper divisors (256026467).

1280132305 is an equidigital number, since it uses as much as digits as its factorization.

1280132305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256026466.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1280132305 is about 35778.9366108050. The cubic root of 1280132305 is about 1085.8044548307.

The spelling of 1280132305 in words is "one billion, two hundred eighty million, one hundred thirty-two thousand, three hundred five".