197890361 has 2 divisors, whose sum is σ = 197890362. Its totient is φ = 197890360.

The previous prime is 197890337. The next prime is 197890369. The reversal of 197890361 is 163098791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197571136 + 319225 = 14056^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 197890361 - 2²² = 193696057 is a prime.

It is not a weakly prime, because it can be changed into another prime (197890369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98945180 + 98945181.

It is an arithmetic number, because the mean of its divisors is an integer number (98945181).

Almost surely, 2^197890361 is an apocalyptic number.

It is an amenable number.

197890361 is a deficient number, since it is larger than the sum of its proper divisors (1).

197890361 is an equidigital number, since it uses as much as digits as its factorization.

197890361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 197890361 is about 14067.3508877827. The cubic root of 197890361 is about 582.7400679309.

The spelling of 197890361 in words is "one hundred ninety-seven million, eight hundred ninety thousand, three hundred sixty-one".