102785855 has 4 divisors (see below), whose sum is σ = 123343032. Its totient is φ = 82228680.

The previous prime is 102785849. The next prime is 102785897. The reversal of 102785855 is 558587201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 558587201 = 1373 ⋅406837.

It is not a de Polignac number, because 102785855 - 2¹⁰ = 102784831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10278581 + ... + 10278590.

It is an arithmetic number, because the mean of its divisors is an integer number (30835758).

Almost surely, 2^102785855 is an apocalyptic number.

102785855 is a deficient number, since it is larger than the sum of its proper divisors (20557177).

102785855 is an equidigital number, since it uses as much as digits as its factorization.

102785855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20557176.

The product of its (nonzero) digits is 112000, while the sum is 41.

The square root of 102785855 is about 10138.3359088166. The cubic root of 102785855 is about 468.4297301464.

The spelling of 102785855 in words is "one hundred two million, seven hundred eighty-five thousand, eight hundred fifty-five".