678481109 has 2 divisors, whose sum is σ = 678481110. Its totient is φ = 678481108.

The previous prime is 678481081. The next prime is 678481171. The reversal of 678481109 is 901184876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 564205009 + 114276100 = 23753^2 + 10690^2 .

It is a cyclic number.

It is not a de Polignac number, because 678481109 - 2²⁰ = 677432533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 678481109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678483109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339240554 + 339240555.

It is an arithmetic number, because the mean of its divisors is an integer number (339240555).

Almost surely, 2^678481109 is an apocalyptic number.

It is an amenable number.

678481109 is a deficient number, since it is larger than the sum of its proper divisors (1).

678481109 is an equidigital number, since it uses as much as digits as its factorization.

678481109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 678481109 is about 26047.6699341803. The cubic root of 678481109 is about 878.7107105533.

The spelling of 678481109 in words is "six hundred seventy-eight million, four hundred eighty-one thousand, one hundred nine".