675617981 has 2 divisors, whose sum is σ = 675617982. Its totient is φ = 675617980.

The previous prime is 675617911. The next prime is 675617989. The reversal of 675617981 is 189716576.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 339812356 + 335805625 = 18434^2 + 18325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-675617981 is a prime.

It is a super-2 number, since 2×675617981² = 912919312501032722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (675617989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337808990 + 337808991.

It is an arithmetic number, because the mean of its divisors is an integer number (337808991).

Almost surely, 2^675617981 is an apocalyptic number.

It is an amenable number.

675617981 is a deficient number, since it is larger than the sum of its proper divisors (1).

675617981 is an equidigital number, since it uses as much as digits as its factorization.

675617981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 50.

The square root of 675617981 is about 25992.6524425654. The cubic root of 675617981 is about 877.4729416472.

The spelling of 675617981 in words is "six hundred seventy-five million, six hundred seventeen thousand, nine hundred eighty-one".