678971931 has 16 divisors (see below), whose sum is σ = 1011685248. Its totient is φ = 401460800.

The previous prime is 678971921. The next prime is 678971933. The reversal of 678971931 is 139179876.

It is a cyclic number.

It is not a de Polignac number, because 678971931 - 2¹⁰ = 678970907 is a prime.

It is a super-2 number, since 2×678971931² = 922005766171737522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (678971933) 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 15 ways as a sum of consecutive naturals, for example, 249561 + ... + 252266.

It is an arithmetic number, because the mean of its divisors is an integer number (63230328).

Almost surely, 2^678971931 is an apocalyptic number.

678971931 is a deficient number, since it is larger than the sum of its proper divisors (332713317).

678971931 is a wasteful number, since it uses less digits than its factorization.

678971931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501882.

The product of its digits is 571536, while the sum is 51.

The square root of 678971931 is about 26057.0898413464. The cubic root of 678971931 is about 878.9225497060.

The spelling of 678971931 in words is "six hundred seventy-eight million, nine hundred seventy-one thousand, nine hundred thirty-one".