197871541 has 4 divisors (see below), whose sum is σ = 226138912. Its totient is φ = 169604172.

The previous prime is 197871521. The next prime is 197871559. The reversal of 197871541 is 145178791.

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, and also an emirpimes, since its reverse is a distinct semiprime: 145178791 = 19 ⋅7640989.

It is a cyclic number.

It is not a de Polignac number, because 197871541 - 2⁷ = 197871413 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 (197871521) 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, 14133675 + ... + 14133688.

It is an arithmetic number, because the mean of its divisors is an integer number (56534728).

Almost surely, 2^197871541 is an apocalyptic number.

It is an amenable number.

197871541 is a deficient number, since it is larger than the sum of its proper divisors (28267371).

197871541 is an equidigital number, since it uses as much as digits as its factorization.

197871541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28267370.

The product of its digits is 70560, while the sum is 43.

The square root of 197871541 is about 14066.6819470691. The cubic root of 197871541 is about 582.7215938700.

The spelling of 197871541 in words is "one hundred ninety-seven million, eight hundred seventy-one thousand, five hundred forty-one".