1312608491 has 2 divisors, whose sum is σ = 1312608492. Its totient is φ = 1312608490.

The previous prime is 1312608487. The next prime is 1312608499. The reversal of 1312608491 is 1948062131.

It is a weak prime.

It is an emirp because it is prime and its reverse (1948062131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1312608491 - 2² = 1312608487 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1312608499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656304245 + 656304246.

It is an arithmetic number, because the mean of its divisors is an integer number (656304246).

Almost surely, 2^1312608491 is an apocalyptic number.

1312608491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312608491 is an equidigital number, since it uses as much as digits as its factorization.

1312608491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1312608491 is about 36229.9391525848. The cubic root of 1312608491 is about 1094.9099516590.

The spelling of 1312608491 in words is "one billion, three hundred twelve million, six hundred eight thousand, four hundred ninety-one".