311080265385781 has 2 divisors, whose sum is σ = 311080265385782. Its totient is φ = 311080265385780.

The previous prime is 311080265385751. The next prime is 311080265385787. The reversal of 311080265385781 is 187583562080113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182130409624900 + 128949855760881 = 13495570^2 + 11355609^2 .

It is a cyclic number.

It is not a de Polignac number, because 311080265385781 - 2⁵ = 311080265385749 is a prime.

It is a super-2 number, since 2×311080265385781² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311080265385787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155540132692890 + 155540132692891.

It is an arithmetic number, because the mean of its divisors is an integer number (155540132692891).

Almost surely, 2^{311080265385781} is an apocalyptic number.

It is an amenable number.

311080265385781 is a deficient number, since it is larger than the sum of its proper divisors (1).

311080265385781 is an equidigital number, since it uses as much as digits as its factorization.

311080265385781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9676800, while the sum is 58.

The spelling of 311080265385781 in words is "three hundred eleven trillion, eighty billion, two hundred sixty-five million, three hundred eighty-five thousand, seven hundred eighty-one".