197979959 has 4 divisors (see below), whose sum is σ = 198033240. Its totient is φ = 197926680.

The previous prime is 197979949. The next prime is 197979961. The reversal of 197979959 is 959979791.

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

It is a cyclic number.

It is not a de Polignac number, because 197979959 - 2⁸ = 197979703 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 197979895 and 197979904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197979949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20612 + ... + 28649.

It is an arithmetic number, because the mean of its divisors is an integer number (49508310).

Almost surely, 2^197979959 is an apocalyptic number.

197979959 is a deficient number, since it is larger than the sum of its proper divisors (53281).

197979959 is an equidigital number, since it uses as much as digits as its factorization.

197979959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53280.

The product of its digits is 14467005, while the sum is 65.

The square root of 197979959 is about 14070.5351355235. The cubic root of 197979959 is about 582.8280029308.

The spelling of 197979959 in words is "one hundred ninety-seven million, nine hundred seventy-nine thousand, nine hundred fifty-nine".