678133381 has 2 divisors, whose sum is σ = 678133382. Its totient is φ = 678133380.

The previous prime is 678133367. The next prime is 678133387. The reversal of 678133381 is 183331876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 565964100 + 112169281 = 23790^2 + 10591^2 .

It is a cyclic number.

It is not a de Polignac number, because 678133381 - 2⁹ = 678132869 is a prime.

It is a super-2 number, since 2×678133381² = 919729764852982322, which contains 22 as substring.

It is equal to p_35178196 and since 678133381 and 35178196 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678133387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339066690 + 339066691.

It is an arithmetic number, because the mean of its divisors is an integer number (339066691).

Almost surely, 2^678133381 is an apocalyptic number.

It is an amenable number.

678133381 is a deficient number, since it is larger than the sum of its proper divisors (1).

678133381 is an equidigital number, since it uses as much as digits as its factorization.

678133381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 678133381 is about 26040.9942398519. The cubic root of 678133381 is about 878.5605690445.

The spelling of 678133381 in words is "six hundred seventy-eight million, one hundred thirty-three thousand, three hundred eighty-one".