1306831697 has 2 divisors, whose sum is σ = 1306831698. Its totient is φ = 1306831696.

The previous prime is 1306831681. The next prime is 1306831703. The reversal of 1306831697 is 7961386031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1063346881 + 243484816 = 32609^2 + 15604^2 .

It is a cyclic number.

It is not a de Polignac number, because 1306831697 - 2⁴ = 1306831681 is a prime.

It is not a weakly prime, because it can be changed into another prime (1306731697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653415848 + 653415849.

It is an arithmetic number, because the mean of its divisors is an integer number (653415849).

Almost surely, 2^1306831697 is an apocalyptic number.

It is an amenable number.

1306831697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1306831697 is an equidigital number, since it uses as much as digits as its factorization.

1306831697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 1306831697 is about 36150.1272058619. The cubic root of 1306831697 is about 1093.3013555138.

The spelling of 1306831697 in words is "one billion, three hundred six million, eight hundred thirty-one thousand, six hundred ninety-seven".