855288781 has 12 divisors (see below), whose sum is σ = 927084252. Its totient is φ = 788361984.

The previous prime is 855288773. The next prime is 855288803. The reversal of 855288781 is 187882558.

It can be written as a sum of positive squares in 2 ways, for example, as 800380681 + 54908100 = 28291^2 + 7410^2 .

It is not a de Polignac number, because 855288781 - 2³ = 855288773 is a prime.

It is a super-2 number, since 2×855288781² = 1463037797808931922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855288761) 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 in 11 ways as a sum of consecutive naturals, for example, 18660 + ... + 45373.

It is an arithmetic number, because the mean of its divisors is an integer number (77257021).

Almost surely, 2^855288781 is an apocalyptic number.

It is an amenable number.

855288781 is a deficient number, since it is larger than the sum of its proper divisors (71795471).

855288781 is a wasteful number, since it uses less digits than its factorization.

855288781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64108 (or 64089 counting only the distinct ones).

The product of its digits is 1433600, while the sum is 52.

The square root of 855288781 is about 29245.3206684420. The cubic root of 855288781 is about 949.2288408503.

The spelling of 855288781 in words is "eight hundred fifty-five million, two hundred eighty-eight thousand, seven hundred eighty-one".