1311655801 has 2 divisors, whose sum is σ = 1311655802. Its totient is φ = 1311655800.

The previous prime is 1311655769. The next prime is 1311655811. The reversal of 1311655801 is 1085561131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1310802025 + 853776 = 36205^2 + 924^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311655801 - 2⁵ = 1311655769 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311655811) 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, 655827900 + 655827901.

It is an arithmetic number, because the mean of its divisors is an integer number (655827901).

Almost surely, 2^1311655801 is an apocalyptic number.

It is an amenable number.

1311655801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311655801 is an equidigital number, since it uses as much as digits as its factorization.

1311655801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 1311655801 is about 36216.7889382811. The cubic root of 1311655801 is about 1094.6449926775.

The spelling of 1311655801 in words is "one billion, three hundred eleven million, six hundred fifty-five thousand, eight hundred one".