678021241 has 2 divisors, whose sum is σ = 678021242. Its totient is φ = 678021240.

The previous prime is 678021233. The next prime is 678021271. The reversal of 678021241 is 142120876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 371911225 + 306110016 = 19285^2 + 17496^2 .

It is a cyclic number.

It is not a de Polignac number, because 678021241 - 2³ = 678021233 is a prime.

It is not a weakly prime, because it can be changed into another prime (678021221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339010620 + 339010621.

It is an arithmetic number, because the mean of its divisors is an integer number (339010621).

Almost surely, 2^678021241 is an apocalyptic number.

It is an amenable number.

678021241 is a deficient number, since it is larger than the sum of its proper divisors (1).

678021241 is an equidigital number, since it uses as much as digits as its factorization.

678021241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 678021241 is about 26038.8410072338. The cubic root of 678021241 is about 878.5121384475.

The spelling of 678021241 in words is "six hundred seventy-eight million, twenty-one thousand, two hundred forty-one".