1306451005 has 4 divisors (see below), whose sum is σ = 1567741212. Its totient is φ = 1045160800.

The previous prime is 1306450993. The next prime is 1306451099. The reversal of 1306451005 is 5001546031.

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 241211961 + 1065239044 = 15531^2 + 32638^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1306451005 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130645096 + ... + 130645105.

It is an arithmetic number, because the mean of its divisors is an integer number (391935303).

Almost surely, 2^1306451005 is an apocalyptic number.

It is an amenable number.

1306451005 is a deficient number, since it is larger than the sum of its proper divisors (261290207).

1306451005 is an equidigital number, since it uses as much as digits as its factorization.

1306451005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261290206.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1306451005 is about 36144.8613913513. The cubic root of 1306451005 is about 1093.1951823158.

Adding to 1306451005 its reverse (5001546031), we get a palindrome (6307997036).

The spelling of 1306451005 in words is "one billion, three hundred six million, four hundred fifty-one thousand, five".