986551 has 4 divisors (see below), whose sum is σ = 1020600. Its totient is φ = 952504.

The previous prime is 986543. The next prime is 986563. The reversal of 986551 is 155689.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 986551 - 2³ = 986543 is a prime.

It is a super-4 number, since 4×986551⁴ (a number of 25 digits) contains 4444 as substring.

It is an Ulam number.

It is a Duffinian 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 (986581) by changing a digit.

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, 16981 + ... + 17038.

It is an arithmetic number, because the mean of its divisors is an integer number (255150).

2⁹⁸⁶⁵⁵¹ is an apocalyptic number.

986551 is a deficient number, since it is larger than the sum of its proper divisors (34049).

986551 is a wasteful number, since it uses less digits than its factorization.

986551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34048.

The product of its digits is 10800, while the sum is 34.

The square root of 986551 is about 993.2527372225. The cubic root of 986551 is about 99.5496751191.

The spelling of 986551 in words is "nine hundred eighty-six thousand, five hundred fifty-one".