978531 has 8 divisors (see below), whose sum is σ = 1309440. Its totient is φ = 649992.

The previous prime is 978521. The next prime is 978541. The reversal of 978531 is 135879.

It is an interprime number because it is at equal distance from previous prime (978521) and next prime (978541).

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

It is not a de Polignac number, because 978531 - 2⁷ = 978403 is a prime.

It is a super-2 number, since 2×978531² = 1915045835922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 978492 and 978501.

It is not an unprimeable number, because it can be changed into a prime (978511) 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 7 ways as a sum of consecutive naturals, for example, 946 + ... + 1688.

It is an arithmetic number, because the mean of its divisors is an integer number (163680).

2⁹⁷⁸⁵³¹ is an apocalyptic number.

978531 is a deficient number, since it is larger than the sum of its proper divisors (330909).

978531 is a wasteful number, since it uses less digits than its factorization.

978531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185.

The product of its digits is 7560, while the sum is 33.

The square root of 978531 is about 989.2072583640. The cubic root of 978531 is about 99.2791833847.

The spelling of 978531 in words is "nine hundred seventy-eight thousand, five hundred thirty-one".