1313265397 has 2 divisors, whose sum is σ = 1313265398. Its totient is φ = 1313265396.

The previous prime is 1313265379. The next prime is 1313265403. The reversal of 1313265397 is 7935623131.

Together with previous prime (1313265379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 864418801 + 448846596 = 29401^2 + 21186^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313265397 - 2¹¹ = 1313263349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313265337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656632698 + 656632699.

It is an arithmetic number, because the mean of its divisors is an integer number (656632699).

Almost surely, 2^1313265397 is an apocalyptic number.

It is an amenable number.

1313265397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313265397 is an equidigital number, since it uses as much as digits as its factorization.

1313265397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 40.

The square root of 1313265397 is about 36239.0038080519. The cubic root of 1313265397 is about 1095.0925735069.

The spelling of 1313265397 in words is "one billion, three hundred thirteen million, two hundred sixty-five thousand, three hundred ninety-seven".