678971 has 2 divisors, whose sum is σ = 678972. Its totient is φ = 678970.

The previous prime is 678959. The next prime is 678989. The reversal of 678971 is 179876.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678971 - 2⁶ = 678907 is a prime.

It is a super-2 number, since 2×678971² = 922003237682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (678901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339485 + 339486.

It is an arithmetic number, because the mean of its divisors is an integer number (339486).

2⁶⁷⁸⁹⁷¹ is an apocalyptic number.

678971 is a deficient number, since it is larger than the sum of its proper divisors (1).

678971 is an equidigital number, since it uses as much as digits as its factorization.

678971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 38.

The square root of 678971 is about 823.9969660138. The cubic root of 678971 is about 87.8922147982.

The spelling of 678971 in words is "six hundred seventy-eight thousand, nine hundred seventy-one".