855534389 has 2 divisors, whose sum is σ = 855534390. Its totient is φ = 855534388.

The previous prime is 855534359. The next prime is 855534391. The reversal of 855534389 is 983435558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 632271025 + 223263364 = 25145^2 + 14942^2 .

It is a cyclic number.

It is not a de Polignac number, because 855534389 - 2¹⁶ = 855468853 is a prime.

Together with 855534391, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855534319) 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, 427767194 + 427767195.

It is an arithmetic number, because the mean of its divisors is an integer number (427767195).

Almost surely, 2^855534389 is an apocalyptic number.

It is an amenable number.

855534389 is a deficient number, since it is larger than the sum of its proper divisors (1).

855534389 is an equidigital number, since it uses as much as digits as its factorization.

855534389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592000, while the sum is 50.

The square root of 855534389 is about 29249.5194661382. The cubic root of 855534389 is about 949.3196935501.

The spelling of 855534389 in words is "eight hundred fifty-five million, five hundred thirty-four thousand, three hundred eighty-nine".