197927813 has 4 divisors (see below), whose sum is σ = 204752940. Its totient is φ = 191102688.

The previous prime is 197927801. The next prime is 197927819. The reversal of 197927813 is 318729791.

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 139665124 + 58262689 = 11818^2 + 7633^2 .

It is a cyclic number.

It is not a de Polignac number, because 197927813 - 2¹⁰ = 197926789 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 (197927819) 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, 3412520 + ... + 3412577.

It is an arithmetic number, because the mean of its divisors is an integer number (51188235).

Almost surely, 2^197927813 is an apocalyptic number.

It is an amenable number.

197927813 is a deficient number, since it is larger than the sum of its proper divisors (6825127).

197927813 is an equidigital number, since it uses as much as digits as its factorization.

197927813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6825126.

The product of its digits is 190512, while the sum is 47.

The square root of 197927813 is about 14068.6819922834. The cubic root of 197927813 is about 582.7768280241.

It can be divided in two parts, 1979 and 27813, that added together give a palindrome (29792).

The spelling of 197927813 in words is "one hundred ninety-seven million, nine hundred twenty-seven thousand, eight hundred thirteen".