978551 has 8 divisors (see below), whose sum is σ = 1144704. Its totient is φ = 819000.

The previous prime is 978541. The next prime is 978569. The reversal of 978551 is 155879.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-978551 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a zygodrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1325 + ... + 1926.

It is an arithmetic number, because the mean of its divisors is an integer number (143088).

2⁹⁷⁸⁵⁵¹ is an apocalyptic number.

978551 is a deficient number, since it is larger than the sum of its proper divisors (166153).

978551 is a wasteful number, since it uses less digits than its factorization.

978551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3301.

The product of its digits is 12600, while the sum is 35.

The square root of 978551 is about 989.2173674173. The cubic root of 978551 is about 99.2798597626.

The spelling of 978551 in words is "nine hundred seventy-eight thousand, five hundred fifty-one".