311212355557 has 2 divisors, whose sum is σ = 311212355558. Its totient is φ = 311212355556.

The previous prime is 311212355479. The next prime is 311212355581. The reversal of 311212355557 is 755553212113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 301671168516 + 9541187041 = 549246^2 + 97679^2 .

It is a cyclic number.

It is not a de Polignac number, because 311212355557 - 2¹⁹ = 311211831269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311212355957) 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, 155606177778 + 155606177779.

It is an arithmetic number, because the mean of its divisors is an integer number (155606177779).

Almost surely, 2^311212355557 is an apocalyptic number.

It is an amenable number.

311212355557 is a deficient number, since it is larger than the sum of its proper divisors (1).

311212355557 is an equidigital number, since it uses as much as digits as its factorization.

311212355557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157500, while the sum is 40.

The spelling of 311212355557 in words is "three hundred eleven billion, two hundred twelve million, three hundred fifty-five thousand, five hundred fifty-seven".