1306131697 has 8 divisors (see below), whose sum is σ = 1420531560. Its totient is φ = 1193721600.

The previous prime is 1306131689. The next prime is 1306131703. The reversal of 1306131697 is 7961316031.

It can be written as a sum of positive squares in 4 ways, for example, as 160376896 + 1145754801 = 12664^2 + 33849^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1306131697 - 2³ = 1306131689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1306131637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 496072 + ... + 498697.

It is an arithmetic number, because the mean of its divisors is an integer number (177566445).

Almost surely, 2^1306131697 is an apocalyptic number.

It is an amenable number.

1306131697 is a deficient number, since it is larger than the sum of its proper divisors (114399863).

1306131697 is a wasteful number, since it uses less digits than its factorization.

1306131697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994883.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 1306131697 is about 36140.4440620200. Note that the first 3 decimals coincide. The cubic root of 1306131697 is about 1093.1061129189.

The spelling of 1306131697 in words is "one billion, three hundred six million, one hundred thirty-one thousand, six hundred ninety-seven".