978725597 has 4 divisors (see below), whose sum is σ = 984959676. Its totient is φ = 972491520.

The previous prime is 978725569. The next prime is 978725599. The reversal of 978725597 is 795527879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 795527879 = 41 ⋅19403119.

It can be written as a sum of positive squares in 2 ways, for example, as 652598116 + 326127481 = 25546^2 + 18059^2 .

It is a cyclic number.

It is not a de Polignac number, because 978725597 - 2¹⁶ = 978660061 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 (978725599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3116804 + ... + 3117117.

It is an arithmetic number, because the mean of its divisors is an integer number (246239919).

Almost surely, 2^978725597 is an apocalyptic number.

It is an amenable number.

978725597 is a deficient number, since it is larger than the sum of its proper divisors (6234079).

978725597 is a wasteful number, since it uses less digits than its factorization.

978725597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6234078.

The product of its digits is 11113200, while the sum is 59.

The square root of 978725597 is about 31284.5904080587. The cubic root of 978725597 is about 992.8576404857.

The spelling of 978725597 in words is "nine hundred seventy-eight million, seven hundred twenty-five thousand, five hundred ninety-seven".