197488913 has 4 divisors (see below), whose sum is σ = 198351540. Its totient is φ = 196626288.

The previous prime is 197488909. The next prime is 197488931. The reversal of 197488913 is 319884791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 319884791 = 3023 ⋅105817.

It can be written as a sum of positive squares in 2 ways, for example, as 131033809 + 66455104 = 11447^2 + 8152^2 .

It is a cyclic number.

It is not a de Polignac number, because 197488913 - 2² = 197488909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197484913) 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, 430970 + ... + 431427.

It is an arithmetic number, because the mean of its divisors is an integer number (49587885).

Almost surely, 2^197488913 is an apocalyptic number.

It is an amenable number.

197488913 is a deficient number, since it is larger than the sum of its proper divisors (862627).

197488913 is an equidigital number, since it uses as much as digits as its factorization.

197488913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862626.

The product of its digits is 435456, while the sum is 50.

The square root of 197488913 is about 14053.0748592612. The cubic root of 197488913 is about 582.3457448569.

The spelling of 197488913 in words is "one hundred ninety-seven million, four hundred eighty-eight thousand, nine hundred thirteen".