197425643 has 4 divisors (see below), whose sum is σ = 197521800. Its totient is φ = 197329488.

The previous prime is 197425633. The next prime is 197425681. The reversal of 197425643 is 346524791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346524791 = 12143 ⋅28537.

It is a cyclic number.

It is not a de Polignac number, because 197425643 - 2²⁶ = 130316779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 197425643.

It is not an unprimeable number, because it can be changed into a prime (197425603) 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, 44930 + ... + 49127.

It is an arithmetic number, because the mean of its divisors is an integer number (49380450).

Almost surely, 2^197425643 is an apocalyptic number.

197425643 is a deficient number, since it is larger than the sum of its proper divisors (96157).

197425643 is an equidigital number, since it uses as much as digits as its factorization.

197425643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96156.

The product of its digits is 181440, while the sum is 41.

The square root of 197425643 is about 14050.8235701684. The cubic root of 197425643 is about 582.2835490436.

The spelling of 197425643 in words is "one hundred ninety-seven million, four hundred twenty-five thousand, six hundred forty-three".