978121 has 9 divisors (see below), whose sum is σ = 1046829. Its totient is φ = 913836.

The previous prime is 978113. The next prime is 978149. The reversal of 978121 is 121879.

The square root of 978121 is 989.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 978121 - 2³ = 978113 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 978121.

It is not an unprimeable number, because it can be changed into a prime (978151) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 22726 + ... + 22768.

978121 is a Friedman number, since it can be written as (982+7)^(1+1), using all its digits and the basic arithmetic operations.

2⁹⁷⁸¹²¹ is an apocalyptic number.

978121 is the 989-th square number and also the 529-th nonagonal number.

978121 is the 495-th centered octagonal number.

It is an amenable number.

978121 is a deficient number, since it is larger than the sum of its proper divisors (68708).

978121 is an equidigital number, since it uses as much as digits as its factorization.

978121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 66 counting only the distinct ones).

The product of its digits is 1008, while the sum is 28.

The cubic root of 978121 is about 99.2653156069.

The spelling of 978121 in words is "nine hundred seventy-eight thousand, one hundred twenty-one".