197287487 has 4 divisors (see below), whose sum is σ = 200066256. Its totient is φ = 194508720.

The previous prime is 197287477. The next prime is 197287501. The reversal of 197287487 is 784782791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 784782791 = 13 ⋅60367907.

It is a cyclic number.

It is not a de Polignac number, because 197287487 - 2⁴ = 197287471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197287477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1389278 + ... + 1389419.

It is an arithmetic number, because the mean of its divisors is an integer number (50016564).

Almost surely, 2^197287487 is an apocalyptic number.

197287487 is a deficient number, since it is larger than the sum of its proper divisors (2778769).

197287487 is an equidigital number, since it uses as much as digits as its factorization.

197287487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778768.

The product of its digits is 1580544, while the sum is 53.

The square root of 197287487 is about 14045.9064143258. The cubic root of 197287487 is about 582.1476924292.

The spelling of 197287487 in words is "one hundred ninety-seven million, two hundred eighty-seven thousand, four hundred eighty-seven".