197149679 has 4 divisors (see below), whose sum is σ = 198330384. Its totient is φ = 195968976.

The previous prime is 197149661. The next prime is 197149691. The reversal of 197149679 is 976941791.

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 197149679 - 2⁸ = 197149423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 197149679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197149609) 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, 590102 + ... + 590435.

It is an arithmetic number, because the mean of its divisors is an integer number (49582596).

Almost surely, 2^197149679 is an apocalyptic number.

197149679 is a deficient number, since it is larger than the sum of its proper divisors (1180705).

197149679 is a wasteful number, since it uses less digits than its factorization.

197149679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180704.

The product of its digits is 857304, while the sum is 53.

The square root of 197149679 is about 14040.9999287800. Note that the first 4 decimals coincide. The cubic root of 197149679 is about 582.0121148228.

The spelling of 197149679 in words is "one hundred ninety-seven million, one hundred forty-nine thousand, six hundred seventy-nine".