1312081801 has 2 divisors, whose sum is σ = 1312081802. Its totient is φ = 1312081800.

The previous prime is 1312081787. The next prime is 1312081807. The reversal of 1312081801 is 1081802131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 954871801 + 357210000 = 30901^2 + 18900^2 .

It is an emirp because it is prime and its reverse (1081802131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1312081801 - 2⁵ = 1312081769 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312081807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656040900 + 656040901.

It is an arithmetic number, because the mean of its divisors is an integer number (656040901).

Almost surely, 2^1312081801 is an apocalyptic number.

It is an amenable number.

1312081801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312081801 is an equidigital number, since it uses as much as digits as its factorization.

1312081801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 1312081801 is about 36222.6697111077. The cubic root of 1312081801 is about 1094.7634862366.

Adding to 1312081801 its reverse (1081802131), we get a palindrome (2393883932).

The spelling of 1312081801 in words is "one billion, three hundred twelve million, eighty-one thousand, eight hundred one".