978791213 has 6 divisors (see below), whose sum is σ = 1033018254. Its totient is φ = 927275544.

The previous prime is 978791173. The next prime is 978791239. The reversal of 978791213 is 312197879.

It can be written as a sum of positive squares in only one way, i.e., 700502089 + 278289124 = 26467^2 + 16682^2 .

It is not a de Polignac number, because 978791213 - 2²⁸ = 710355757 is a prime.

It is a super-2 number, since 2×978791213² = 1916064477292022738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978791273) 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 5 ways as a sum of consecutive naturals, for example, 1355306 + ... + 1356027.

It is an arithmetic number, because the mean of its divisors is an integer number (172169709).

Almost surely, 2^978791213 is an apocalyptic number.

It is an amenable number.

978791213 is a deficient number, since it is larger than the sum of its proper divisors (54227041).

978791213 is a wasteful number, since it uses less digits than its factorization.

978791213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2711371 (or 2711352 counting only the distinct ones).

The product of its digits is 190512, while the sum is 47.

The square root of 978791213 is about 31285.6390856891. The cubic root of 978791213 is about 992.8798278047.

The spelling of 978791213 in words is "nine hundred seventy-eight million, seven hundred ninety-one thousand, two hundred thirteen".