197623409 has 2 divisors, whose sum is σ = 197623410. Its totient is φ = 197623408.

The previous prime is 197623381. The next prime is 197623411. The reversal of 197623409 is 904326791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148230625 + 49392784 = 12175^2 + 7028^2 .

It is a cyclic number.

It is not a de Polignac number, because 197623409 - 2¹² = 197619313 is a prime.

Together with 197623411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197623499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98811704 + 98811705.

It is an arithmetic number, because the mean of its divisors is an integer number (98811705).

Almost surely, 2^197623409 is an apocalyptic number.

It is an amenable number.

197623409 is a deficient number, since it is larger than the sum of its proper divisors (1).

197623409 is an equidigital number, since it uses as much as digits as its factorization.

197623409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 197623409 is about 14057.8593320605. The cubic root of 197623409 is about 582.4779132888.

The spelling of 197623409 in words is "one hundred ninety-seven million, six hundred twenty-three thousand, four hundred nine".