197312137 has 4 divisors (see below), whose sum is σ = 215249616. Its totient is φ = 179374660.

The previous prime is 197312111. The next prime is 197312189. The reversal of 197312137 is 731213791.

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 a cyclic number.

It is not a de Polignac number, because 197312137 - 2¹⁹ = 196787849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197312537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8968723 + ... + 8968744.

It is an arithmetic number, because the mean of its divisors is an integer number (53812404).

Almost surely, 2^197312137 is an apocalyptic number.

It is an amenable number.

197312137 is a deficient number, since it is larger than the sum of its proper divisors (17937479).

197312137 is a wasteful number, since it uses less digits than its factorization.

197312137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17937478.

The product of its digits is 7938, while the sum is 34.

The square root of 197312137 is about 14046.7838667789. The cubic root of 197312137 is about 582.1719368170.

The spelling of 197312137 in words is "one hundred ninety-seven million, three hundred twelve thousand, one hundred thirty-seven".