1311255522061 has 2 divisors, whose sum is σ = 1311255522062. Its totient is φ = 1311255522060.

The previous prime is 1311255522043. The next prime is 1311255522077. The reversal of 1311255522061 is 1602255521131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1070573049225 + 240682472836 = 1034685^2 + 490594^2 .

It is an emirp because it is prime and its reverse (1602255521131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1311255522061 - 2³³ = 1302665587469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311255522001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655627761030 + 655627761031.

It is an arithmetic number, because the mean of its divisors is an integer number (655627761031).

Almost surely, 2^{1311255522061} is an apocalyptic number.

It is an amenable number.

1311255522061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311255522061 is an equidigital number, since it uses as much as digits as its factorization.

1311255522061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 34.

It can be divided in two parts, 1311255 and 522061, that added together give a square (1833316 = 1354²).

The spelling of 1311255522061 in words is "one trillion, three hundred eleven billion, two hundred fifty-five million, five hundred twenty-two thousand, sixty-one".