197705381 has 2 divisors, whose sum is σ = 197705382. Its totient is φ = 197705380.

The previous prime is 197705377. The next prime is 197705411. The reversal of 197705381 is 183507791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195720100 + 1985281 = 13990^2 + 1409^2 .

It is a cyclic number.

It is not a de Polignac number, because 197705381 - 2² = 197705377 is a prime.

It is a super-2 number, since 2×197705381² = 78174835352710322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197705311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98852690 + 98852691.

It is an arithmetic number, because the mean of its divisors is an integer number (98852691).

Almost surely, 2^197705381 is an apocalyptic number.

It is an amenable number.

197705381 is a deficient number, since it is larger than the sum of its proper divisors (1).

197705381 is an equidigital number, since it uses as much as digits as its factorization.

197705381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 41.

The square root of 197705381 is about 14060.7745519228. The cubic root of 197705381 is about 582.5584372841.

The spelling of 197705381 in words is "one hundred ninety-seven million, seven hundred five thousand, three hundred eighty-one".