985551 has 16 divisors (see below), whose sum is σ = 1525248. Its totient is φ = 554400.

The previous prime is 985547. The next prime is 985571. The reversal of 985551 is 155589.

It is not a de Polignac number, because 985551 - 2² = 985547 is a prime.

985551 is a lucky number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1161 + ... + 1821.

It is an arithmetic number, because the mean of its divisors is an integer number (95328).

2⁹⁸⁵⁵⁵¹ is an apocalyptic number.

985551 is a deficient number, since it is larger than the sum of its proper divisors (539697).

985551 is a wasteful number, since it uses less digits than its factorization.

985551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742.

The product of its digits is 9000, while the sum is 33.

The square root of 985551 is about 992.7492130443. The cubic root of 985551 is about 99.5160281579.

The spelling of 985551 in words is "nine hundred eighty-five thousand, five hundred fifty-one".