678613031 has 2 divisors, whose sum is σ = 678613032. Its totient is φ = 678613030.

The previous prime is 678613027. The next prime is 678613043. The reversal of 678613031 is 130316876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678613031 - 2² = 678613027 is a prime.

It is a super-2 number, since 2×678613031² = 921031291686013922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 678612982 and 678613000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678613631) 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 as a sum of consecutive naturals, namely, 339306515 + 339306516.

It is an arithmetic number, because the mean of its divisors is an integer number (339306516).

Almost surely, 2^678613031 is an apocalyptic number.

678613031 is a deficient number, since it is larger than the sum of its proper divisors (1).

678613031 is an equidigital number, since it uses as much as digits as its factorization.

678613031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 678613031 is about 26050.2021297340. The cubic root of 678613031 is about 878.7676582269.

The spelling of 678613031 in words is "six hundred seventy-eight million, six hundred thirteen thousand, thirty-one".