197489947 has 2 divisors, whose sum is σ = 197489948. Its totient is φ = 197489946.

The previous prime is 197489923. The next prime is 197489959. The reversal of 197489947 is 749984791.

It is a strong prime.

It is an emirp because it is prime and its reverse (749984791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197489947 - 2²⁷ = 63272219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 197489891 and 197489900.

It is not a weakly prime, because it can be changed into another prime (197489647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98744973 + 98744974.

It is an arithmetic number, because the mean of its divisors is an integer number (98744974).

Almost surely, 2^197489947 is an apocalyptic number.

197489947 is a deficient number, since it is larger than the sum of its proper divisors (1).

197489947 is an equidigital number, since it uses as much as digits as its factorization.

197489947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 58.

The square root of 197489947 is about 14053.1116483148. Note that the first 3 decimals coincide. The cubic root of 197489947 is about 582.3467611915.

The spelling of 197489947 in words is "one hundred ninety-seven million, four hundred eighty-nine thousand, nine hundred forty-seven".