197678881 has 2 divisors, whose sum is σ = 197678882. Its totient is φ = 197678880.

The previous prime is 197678863. The next prime is 197678893. The reversal of 197678881 is 188876791.

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., 164224225 + 33454656 = 12815^2 + 5784^2 .

It is a cyclic number.

It is not a de Polignac number, because 197678881 - 2⁵ = 197678849 is a prime.

It is a super-2 number, since 2×197678881² = 78153879986824322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197678821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98839440 + 98839441.

It is an arithmetic number, because the mean of its divisors is an integer number (98839441).

Almost surely, 2^197678881 is an apocalyptic number.

It is an amenable number.

197678881 is a deficient number, since it is larger than the sum of its proper divisors (1).

197678881 is an equidigital number, since it uses as much as digits as its factorization.

197678881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1354752, while the sum is 55.

The square root of 197678881 is about 14059.8321824978. The cubic root of 197678881 is about 582.5324078318.

The spelling of 197678881 in words is "one hundred ninety-seven million, six hundred seventy-eight thousand, eight hundred eighty-one".