1312201081 has 2 divisors, whose sum is σ = 1312201082. Its totient is φ = 1312201080.

The previous prime is 1312201069. The next prime is 1312201127. The reversal of 1312201081 is 1801022131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 713958400 + 598242681 = 26720^2 + 24459^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312201081 is a prime.

It is a super-2 number, since 2×1312201081² = 3443743353955137122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1312201001) 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, 656100540 + 656100541.

It is an arithmetic number, because the mean of its divisors is an integer number (656100541).

Almost surely, 2^1312201081 is an apocalyptic number.

It is an amenable number.

1312201081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312201081 is an equidigital number, since it uses as much as digits as its factorization.

1312201081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1312201081 is about 36224.3161564163. The cubic root of 1312201081 is about 1094.7966598369.

The spelling of 1312201081 in words is "one billion, three hundred twelve million, two hundred one thousand, eighty-one".