197287489 has 4 divisors (see below), whose sum is σ = 225471424. Its totient is φ = 169103556.

The previous prime is 197287477. The next prime is 197287501. The reversal of 197287489 is 984782791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (197287477) and next prime (197287501).

It is a cyclic number.

It is not a de Polignac number, because 197287489 - 2⁷ = 197287361 is a prime.

It is a super-3 number, since 3×197287489³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197287459) 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, 14091957 + ... + 14091970.

It is an arithmetic number, because the mean of its divisors is an integer number (56367856).

Almost surely, 2^197287489 is an apocalyptic number.

It is an amenable number.

197287489 is a deficient number, since it is larger than the sum of its proper divisors (28183935).

197287489 is an equidigital number, since it uses as much as digits as its factorization.

197287489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28183934.

The product of its digits is 2032128, while the sum is 55.

The square root of 197287489 is about 14045.9064855210. The cubic root of 197287489 is about 582.1476943964.

The spelling of 197287489 in words is "one hundred ninety-seven million, two hundred eighty-seven thousand, four hundred eighty-nine".