676658981 has 2 divisors, whose sum is σ = 676658982. Its totient is φ = 676658980.

The previous prime is 676658971. The next prime is 676658987. The reversal of 676658981 is 189856676.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 486908356 + 189750625 = 22066^2 + 13775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-676658981 is a prime.

It is a super-2 number, since 2×676658981² = 915734753135916722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (676658987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338329490 + 338329491.

It is an arithmetic number, because the mean of its divisors is an integer number (338329491).

Almost surely, 2^676658981 is an apocalyptic number.

It is an amenable number.

676658981 is a deficient number, since it is larger than the sum of its proper divisors (1).

676658981 is an equidigital number, since it uses as much as digits as its factorization.

676658981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 56.

The square root of 676658981 is about 26012.6696246272. The cubic root of 676658981 is about 877.9233838635.

The spelling of 676658981 in words is "six hundred seventy-six million, six hundred fifty-eight thousand, nine hundred eighty-one".