197137645 has 4 divisors (see below), whose sum is σ = 236565180. Its totient is φ = 157710112.

The previous prime is 197137643. The next prime is 197137691. The reversal of 197137645 is 546731791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60668521 + 136469124 = 7789^2 + 11682^2 .

It is a cyclic number.

It is not a de Polignac number, because 197137645 - 2¹ = 197137643 is a prime.

It is a super-3 number, since 3×197137645³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197137643) 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, 19713760 + ... + 19713769.

It is an arithmetic number, because the mean of its divisors is an integer number (59141295).

Almost surely, 2^197137645 is an apocalyptic number.

It is an amenable number.

197137645 is a deficient number, since it is larger than the sum of its proper divisors (39427535).

197137645 is an equidigital number, since it uses as much as digits as its factorization.

197137645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39427534.

The product of its digits is 158760, while the sum is 43.

The square root of 197137645 is about 14040.5713915068. The cubic root of 197137645 is about 582.0002725915. Note that the first 3 decimals are identical.

The spelling of 197137645 in words is "one hundred ninety-seven million, one hundred thirty-seven thousand, six hundred forty-five".