197391379837 has 4 divisors (see below), whose sum is σ = 197438913820. Its totient is φ = 197343845856.

The previous prime is 197391379811. The next prime is 197391379879. The reversal of 197391379837 is 738973193791.

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 92993892601 + 104397487236 = 304949^2 + 323106^2 .

It is a cyclic number.

It is not a de Polignac number, because 197391379837 - 2⁷ = 197391379709 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 (197391379807) 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, 23760762 + ... + 23769067.

It is an arithmetic number, because the mean of its divisors is an integer number (49359728455).

Almost surely, 2^197391379837 is an apocalyptic number.

It is an amenable number.

197391379837 is a deficient number, since it is larger than the sum of its proper divisors (47533983).

197391379837 is an equidigital number, since it uses as much as digits as its factorization.

197391379837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47533982.

The product of its digits is 54010152, while the sum is 67.

The spelling of 197391379837 in words is "one hundred ninety-seven billion, three hundred ninety-one million, three hundred seventy-nine thousand, eight hundred thirty-seven".