197881247 has 2 divisors, whose sum is σ = 197881248. Its totient is φ = 197881246.

The previous prime is 197881237. The next prime is 197881279. The reversal of 197881247 is 742188791.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (742188791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197881247 - 2¹⁶ = 197815711 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197881237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98940623 + 98940624.

It is an arithmetic number, because the mean of its divisors is an integer number (98940624).

Almost surely, 2^197881247 is an apocalyptic number.

197881247 is a deficient number, since it is larger than the sum of its proper divisors (1).

197881247 is an equidigital number, since it uses as much as digits as its factorization.

197881247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 47.

The square root of 197881247 is about 14067.0269424637. The cubic root of 197881247 is about 582.7311216058.

The spelling of 197881247 in words is "one hundred ninety-seven million, eight hundred eighty-one thousand, two hundred forty-seven".