855061391281 has 2 divisors, whose sum is σ = 855061391282. Its totient is φ = 855061391280.

The previous prime is 855061391237. The next prime is 855061391293. The reversal of 855061391281 is 182193160558.

855061391281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 537406286400 + 317655104881 = 733080^2 + 563609^2 .

It is a cyclic number.

It is not a de Polignac number, because 855061391281 - 2¹⁹ = 855060866993 is a prime.

It is a super-2 number, since 2×855061391281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (855061391231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427530695640 + 427530695641.

It is an arithmetic number, because the mean of its divisors is an integer number (427530695641).

Almost surely, 2^855061391281 is an apocalyptic number.

It is an amenable number.

855061391281 is a deficient number, since it is larger than the sum of its proper divisors (1).

855061391281 is an equidigital number, since it uses as much as digits as its factorization.

855061391281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 49.

The spelling of 855061391281 in words is "eight hundred fifty-five billion, sixty-one million, three hundred ninety-one thousand, two hundred eighty-one".