197450509 has 2 divisors, whose sum is σ = 197450510. Its totient is φ = 197450508.

The previous prime is 197450471. The next prime is 197450549. The reversal of 197450509 is 905054791.

It is an a-pointer prime, because the next prime (197450549) can be obtained adding 197450509 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133402500 + 64048009 = 11550^2 + 8003^2 .

It is a cyclic number.

It is not a de Polignac number, because 197450509 - 2⁷ = 197450381 is a prime.

It is a super-3 number, since 3×197450509³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197450549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98725254 + 98725255.

It is an arithmetic number, because the mean of its divisors is an integer number (98725255).

Almost surely, 2^197450509 is an apocalyptic number.

It is an amenable number.

197450509 is a deficient number, since it is larger than the sum of its proper divisors (1).

197450509 is an equidigital number, since it uses as much as digits as its factorization.

197450509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 197450509 is about 14051.7084014720. The cubic root of 197450509 is about 582.3079944578.

The spelling of 197450509 in words is "one hundred ninety-seven million, four hundred fifty thousand, five hundred nine".