197387381 has 2 divisors, whose sum is σ = 197387382. Its totient is φ = 197387380.

The previous prime is 197387353. The next prime is 197387413. The reversal of 197387381 is 183783791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191822500 + 5564881 = 13850^2 + 2359^2 .

It is an emirp because it is prime and its reverse (183783791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197387381 is a prime.

It is a super-2 number, since 2×197387381² = 77923556356078322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197387681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98693690 + 98693691.

It is an arithmetic number, because the mean of its divisors is an integer number (98693691).

Almost surely, 2^197387381 is an apocalyptic number.

It is an amenable number.

197387381 is a deficient number, since it is larger than the sum of its proper divisors (1).

197387381 is an equidigital number, since it uses as much as digits as its factorization.

197387381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 47.

The square root of 197387381 is about 14049.4619469928. The cubic root of 197387381 is about 582.2459302009.

The spelling of 197387381 in words is "one hundred ninety-seven million, three hundred eighty-seven thousand, three hundred eighty-one".