855061391237 has 2 divisors, whose sum is σ = 855061391238. Its totient is φ = 855061391236.

The previous prime is 855061391231. The next prime is 855061391281. The reversal of 855061391237 is 732193160558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 686858055361 + 168203335876 = 828769^2 + 410126^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-855061391237 is a prime.

It is a super-2 number, since 2×855061391237² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427530695618 + 427530695619.

It is an arithmetic number, because the mean of its divisors is an integer number (427530695619).

Almost surely, 2^855061391237 is an apocalyptic number.

It is an amenable number.

855061391237 is a deficient number, since it is larger than the sum of its proper divisors (1).

855061391237 is an equidigital number, since it uses as much as digits as its factorization.

855061391237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1360800, while the sum is 50.

The spelling of 855061391237 in words is "eight hundred fifty-five billion, sixty-one million, three hundred ninety-one thousand, two hundred thirty-seven".