197860009 has 2 divisors, whose sum is σ = 197860010. Its totient is φ = 197860008.

The previous prime is 197859997. The next prime is 197860043. The reversal of 197860009 is 900068791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158760000 + 39100009 = 12600^2 + 6253^2 .

It is a cyclic number.

It is not a de Polignac number, because 197860009 - 2⁷ = 197859881 is a prime.

It is a super-2 number, since 2×197860009² = 78297166322960162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (197860049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98930004 + 98930005.

It is an arithmetic number, because the mean of its divisors is an integer number (98930005).

Almost surely, 2^197860009 is an apocalyptic number.

It is an amenable number.

197860009 is a deficient number, since it is larger than the sum of its proper divisors (1).

197860009 is an equidigital number, since it uses as much as digits as its factorization.

197860009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 197860009 is about 14066.2720363286. The cubic root of 197860009 is about 582.7102732662.

The spelling of 197860009 in words is "one hundred ninety-seven million, eight hundred sixty thousand, nine".