855061391231 has 2 divisors, whose sum is σ = 855061391232. Its totient is φ = 855061391230.

The previous prime is 855061391189. The next prime is 855061391237. The reversal of 855061391231 is 132193160558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 855061391231 - 2⁶ = 855061391167 is a prime.

It is a super-2 number, since 2×855061391231² (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 (855061391237) 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, 427530695615 + 427530695616.

It is an arithmetic number, because the mean of its divisors is an integer number (427530695616).

Almost surely, 2^855061391231 is an apocalyptic number.

855061391231 is a deficient number, since it is larger than the sum of its proper divisors (1).

855061391231 is an equidigital number, since it uses as much as digits as its factorization.

855061391231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 855061391231 in words is "eight hundred fifty-five billion, sixty-one million, three hundred ninety-one thousand, two hundred thirty-one".