197456009 has 4 divisors (see below), whose sum is σ = 197948820. Its totient is φ = 196963200.

The previous prime is 197455933. The next prime is 197456029. The reversal of 197456009 is 900654791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 900654791 = 11657 ⋅77263.

It can be written as a sum of positive squares in 2 ways, for example, as 132894784 + 64561225 = 11528^2 + 8035^2 .

It is a cyclic number.

It is not a de Polignac number, because 197456009 - 2²⁴ = 180678793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197456029) 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 in 3 ways as a sum of consecutive naturals, for example, 245804 + ... + 246605.

It is an arithmetic number, because the mean of its divisors is an integer number (49487205).

Almost surely, 2^197456009 is an apocalyptic number.

It is an amenable number.

197456009 is a deficient number, since it is larger than the sum of its proper divisors (492811).

197456009 is an equidigital number, since it uses as much as digits as its factorization.

197456009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492810.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 197456009 is about 14051.9041058499. The cubic root of 197456009 is about 582.3134011532.

The spelling of 197456009 in words is "one hundred ninety-seven million, four hundred fifty-six thousand, nine".