678132569 has 2 divisors, whose sum is σ = 678132570. Its totient is φ = 678132568.

The previous prime is 678132541. The next prime is 678132571. The reversal of 678132569 is 965231876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 644550544 + 33582025 = 25388^2 + 5795^2 .

It is a cyclic number.

It is not a de Polignac number, because 678132569 - 2⁸ = 678132313 is a prime.

It is a super-2 number, since 2×678132569² = 919727562277079522, which contains 22 as substring.

Together with 678132571, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (678132599) 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 as a sum of consecutive naturals, namely, 339066284 + 339066285.

It is an arithmetic number, because the mean of its divisors is an integer number (339066285).

Almost surely, 2^678132569 is an apocalyptic number.

It is an amenable number.

678132569 is a deficient number, since it is larger than the sum of its proper divisors (1).

678132569 is an equidigital number, since it uses as much as digits as its factorization.

678132569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 47.

The square root of 678132569 is about 26040.9786490447. The cubic root of 678132569 is about 878.5602183802.

The spelling of 678132569 in words is "six hundred seventy-eight million, one hundred thirty-two thousand, five hundred sixty-nine".