855517489 has 4 divisors (see below), whose sum is σ = 856095856. Its totient is φ = 854939124.

The previous prime is 855517483. The next prime is 855517501. The reversal of 855517489 is 984715558.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 855517489 - 2¹³ = 855509297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855517483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 286959 + ... + 289924.

It is an arithmetic number, because the mean of its divisors is an integer number (214023964).

Almost surely, 2^855517489 is an apocalyptic number.

It is an amenable number.

855517489 is a deficient number, since it is larger than the sum of its proper divisors (578367).

855517489 is a wasteful number, since it uses less digits than its factorization.

855517489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578366.

The product of its digits is 2016000, while the sum is 52.

The square root of 855517489 is about 29249.2305710766. The cubic root of 855517489 is about 949.3134426389.

The spelling of 855517489 in words is "eight hundred fifty-five million, five hundred seventeen thousand, four hundred eighty-nine".