197537993 has 2 divisors, whose sum is σ = 197537994. Its totient is φ = 197537992.

The previous prime is 197537987. The next prime is 197538013. The reversal of 197537993 is 399735791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172055689 + 25482304 = 13117^2 + 5048^2 .

It is a cyclic number.

It is not a de Polignac number, because 197537993 - 2¹⁴ = 197521609 is a prime.

It is not a weakly prime, because it can be changed into another prime (197537933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98768996 + 98768997.

It is an arithmetic number, because the mean of its divisors is an integer number (98768997).

Almost surely, 2^197537993 is an apocalyptic number.

It is an amenable number.

197537993 is a deficient number, since it is larger than the sum of its proper divisors (1).

197537993 is an equidigital number, since it uses as much as digits as its factorization.

197537993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1607445, while the sum is 53.

The square root of 197537993 is about 14054.8209878319. The cubic root of 197537993 is about 582.3939824370.

The spelling of 197537993 in words is "one hundred ninety-seven million, five hundred thirty-seven thousand, nine hundred ninety-three".