1312191497 has 2 divisors, whose sum is σ = 1312191498. Its totient is φ = 1312191496.

The previous prime is 1312191479. The next prime is 1312191521. The reversal of 1312191497 is 7941912131.

Together with previous prime (1312191479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1223530441 + 88661056 = 34979^2 + 9416^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312191497 - 2⁸ = 1312191241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1312191497.

It is not a weakly prime, because it can be changed into another prime (1312191197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656095748 + 656095749.

It is an arithmetic number, because the mean of its divisors is an integer number (656095749).

Almost surely, 2^1312191497 is an apocalyptic number.

It is an amenable number.

1312191497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312191497 is an equidigital number, since it uses as much as digits as its factorization.

1312191497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 38.

The square root of 1312191497 is about 36224.1838693434. The cubic root of 1312191497 is about 1094.7939944535.

The spelling of 1312191497 in words is "one billion, three hundred twelve million, one hundred ninety-one thousand, four hundred ninety-seven".