197618009 has 2 divisors, whose sum is σ = 197618010. Its totient is φ = 197618008.

The previous prime is 197617967. The next prime is 197618039. The reversal of 197618009 is 900816791.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179640409 + 17977600 = 13403^2 + 4240^2 .

It is a cyclic number.

It is not a de Polignac number, because 197618009 - 2⁸ = 197617753 is a prime.

It is a super-2 number, since 2×197618009² = 78105754962248162, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197618039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98809004 + 98809005.

It is an arithmetic number, because the mean of its divisors is an integer number (98809005).

Almost surely, 2^197618009 is an apocalyptic number.

It is an amenable number.

197618009 is a deficient number, since it is larger than the sum of its proper divisors (1).

197618009 is an equidigital number, since it uses as much as digits as its factorization.

197618009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 197618009 is about 14057.6672673669. The cubic root of 197618009 is about 582.4726078961.

The spelling of 197618009 in words is "one hundred ninety-seven million, six hundred eighteen thousand, nine".