1312051691 has 2 divisors, whose sum is σ = 1312051692. Its totient is φ = 1312051690.

The previous prime is 1312051681. The next prime is 1312051777. The reversal of 1312051691 is 1961502131.

It is a weak prime.

It is an emirp because it is prime and its reverse (1961502131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1312051691 - 2⁶ = 1312051627 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312051621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656025845 + 656025846.

It is an arithmetic number, because the mean of its divisors is an integer number (656025846).

Almost surely, 2^1312051691 is an apocalyptic number.

1312051691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312051691 is an equidigital number, since it uses as much as digits as its factorization.

1312051691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 1312051691 is about 36222.2540850235. The cubic root of 1312051691 is about 1094.7551118652.

The spelling of 1312051691 in words is "one billion, three hundred twelve million, fifty-one thousand, six hundred ninety-one".