1311000003997 has 2 divisors, whose sum is σ = 1311000003998. Its totient is φ = 1311000003996.

The previous prime is 1311000003977. The next prime is 1311000004007. The reversal of 1311000003997 is 7993000001131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1178670663556 + 132329340441 = 1085666^2 + 363771^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311000003997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311000003977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655500001998 + 655500001999.

It is an arithmetic number, because the mean of its divisors is an integer number (655500001999).

Almost surely, 2^{1311000003997} is an apocalyptic number.

It is an amenable number.

1311000003997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311000003997 is an equidigital number, since it uses as much as digits as its factorization.

1311000003997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103, while the sum is 34.

The spelling of 1311000003997 in words is "one trillion, three hundred eleven billion, three thousand, nine hundred ninety-seven".