311051303551661 has 2 divisors, whose sum is σ = 311051303551662. Its totient is φ = 311051303551660.

The previous prime is 311051303551657. The next prime is 311051303551669. The reversal of 311051303551661 is 166155303150113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310260393924100 + 790909627561 = 17614210^2 + 889331^2 .

It is an emirp because it is prime and its reverse (166155303150113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311051303551661 - 2² = 311051303551657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311051303551669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155525651775830 + 155525651775831.

It is an arithmetic number, because the mean of its divisors is an integer number (155525651775831).

Almost surely, 2^{311051303551661} is an apocalyptic number.

It is an amenable number.

311051303551661 is a deficient number, since it is larger than the sum of its proper divisors (1).

311051303551661 is an equidigital number, since it uses as much as digits as its factorization.

311051303551661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 121500, while the sum is 41.

The spelling of 311051303551661 in words is "three hundred eleven trillion, fifty-one billion, three hundred three million, five hundred fifty-one thousand, six hundred sixty-one".