197991413 has 2 divisors, whose sum is σ = 197991414. Its totient is φ = 197991412.

The previous prime is 197991379. The next prime is 197991427. The reversal of 197991413 is 314199791.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154206724 + 43784689 = 12418^2 + 6617^2 .

It is an emirp because it is prime and its reverse (314199791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197991413 - 2¹⁰ = 197990389 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197991113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98995706 + 98995707.

It is an arithmetic number, because the mean of its divisors is an integer number (98995707).

Almost surely, 2^197991413 is an apocalyptic number.

It is an amenable number.

197991413 is a deficient number, since it is larger than the sum of its proper divisors (1).

197991413 is an equidigital number, since it uses as much as digits as its factorization.

197991413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 44.

The square root of 197991413 is about 14070.9421504034. The cubic root of 197991413 is about 582.8392424240.

It can be divided in two parts, 19799 and 1413, that added together give a palindrome (21212).

The spelling of 197991413 in words is "one hundred ninety-seven million, nine hundred ninety-one thousand, four hundred thirteen".