197306381 has 2 divisors, whose sum is σ = 197306382. Its totient is φ = 197306380.

The previous prime is 197306377. The next prime is 197306383. The reversal of 197306381 is 183603791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188101225 + 9205156 = 13715^2 + 3034^2 .

It is a cyclic number.

It is not a de Polignac number, because 197306381 - 2² = 197306377 is a prime.

It is a super-2 number, since 2×197306381² = 77859615966634322, which contains 22 as substring.

Together with 197306383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197306383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98653190 + 98653191.

It is an arithmetic number, because the mean of its divisors is an integer number (98653191).

Almost surely, 2^197306381 is an apocalyptic number.

It is an amenable number.

197306381 is a deficient number, since it is larger than the sum of its proper divisors (1).

197306381 is an equidigital number, since it uses as much as digits as its factorization.

197306381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 197306381 is about 14046.5789785271. The cubic root of 197306381 is about 582.1662757119.

The spelling of 197306381 in words is "one hundred ninety-seven million, three hundred six thousand, three hundred eighty-one".