285551 has 12 divisors (see below), whose sum is σ = 347472. Its totient is φ = 229824.

The previous prime is 285539. The next prime is 285553. The reversal of 285551 is 155582.

It is not a de Polignac number, because 285551 - 2¹⁰ = 284527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 285551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2471 + ... + 2583.

It is an arithmetic number, because the mean of its divisors is an integer number (28956).

2²⁸⁵⁵⁵¹ is an apocalyptic number.

285551 is a deficient number, since it is larger than the sum of its proper divisors (61921).

285551 is a wasteful number, since it uses less digits than its factorization.

285551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 139 counting only the distinct ones).

The product of its digits is 2000, while the sum is 26.

The square root of 285551 is about 534.3697221962. The cubic root of 285551 is about 65.8508262368.

The spelling of 285551 in words is "two hundred eighty-five thousand, five hundred fifty-one".