978514021 has 4 divisors (see below), whose sum is σ = 978594700. Its totient is φ = 978433344.

The previous prime is 978514013. The next prime is 978514049. The reversal of 978514021 is 120415879.

978514021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is the 12771-st star number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 626951521 + 351562500 = 25039^2 + 18750^2 .

It is a cyclic number.

It is not a de Polignac number, because 978514021 - 2³ = 978514013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978514051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18036 + ... + 47773.

It is an arithmetic number, because the mean of its divisors is an integer number (244648675).

Almost surely, 2^978514021 is an apocalyptic number.

It is an amenable number.

978514021 is a deficient number, since it is larger than the sum of its proper divisors (80679).

978514021 is a wasteful number, since it uses less digits than its factorization.

978514021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80678.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 978514021 is about 31281.2087522206. The cubic root of 978514021 is about 992.7860916649.

The spelling of 978514021 in words is "nine hundred seventy-eight million, five hundred fourteen thousand, twenty-one".