197140644839 has 4 divisors (see below), whose sum is σ = 197242633656. Its totient is φ = 197038656024.

The previous prime is 197140644817. The next prime is 197140644853. The reversal of 197140644839 is 938446041791.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197140644839 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 (197140644739) 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, 50991509 + ... + 50995374.

It is an arithmetic number, because the mean of its divisors is an integer number (49310658414).

Almost surely, 2^197140644839 is an apocalyptic number.

197140644839 is a deficient number, since it is larger than the sum of its proper divisors (101988817).

197140644839 is a wasteful number, since it uses less digits than its factorization.

197140644839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101988816.

The product of its (nonzero) digits is 5225472, while the sum is 56.

The spelling of 197140644839 in words is "one hundred ninety-seven billion, one hundred forty million, six hundred forty-four thousand, eight hundred thirty-nine".