197550839 has 2 divisors, whose sum is σ = 197550840. Its totient is φ = 197550838.

The previous prime is 197550811. The next prime is 197550853. The reversal of 197550839 is 938055791.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197550839 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 197550793 and 197550802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197550869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98775419 + 98775420.

It is an arithmetic number, because the mean of its divisors is an integer number (98775420).

Almost surely, 2^197550839 is an apocalyptic number.

197550839 is a deficient number, since it is larger than the sum of its proper divisors (1).

197550839 is an equidigital number, since it uses as much as digits as its factorization.

197550839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 340200, while the sum is 47.

The square root of 197550839 is about 14055.2779766179. The cubic root of 197550839 is about 582.4066066261.

The spelling of 197550839 in words is "one hundred ninety-seven million, five hundred fifty thousand, eight hundred thirty-nine".