678554291 has 2 divisors, whose sum is σ = 678554292. Its totient is φ = 678554290.

The previous prime is 678554281. The next prime is 678554293. The reversal of 678554291 is 192455876.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 678554291 - 2¹⁴ = 678537907 is a prime.

Together with 678554293, 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 (678554293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339277145 + 339277146.

It is an arithmetic number, because the mean of its divisors is an integer number (339277146).

Almost surely, 2^678554291 is an apocalyptic number.

678554291 is a deficient number, since it is larger than the sum of its proper divisors (1).

678554291 is an equidigital number, since it uses as much as digits as its factorization.

678554291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 47.

The square root of 678554291 is about 26049.0746668668. The cubic root of 678554291 is about 878.7423024402.

The spelling of 678554291 in words is "six hundred seventy-eight million, five hundred fifty-four thousand, two hundred ninety-one".