197079817 has 4 divisors (see below), whose sum is σ = 214996176. Its totient is φ = 179163460.

The previous prime is 197079809. The next prime is 197079821. The reversal of 197079817 is 718970791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 197079817 - 2³ = 197079809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197079887) 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, 8958163 + ... + 8958184.

It is an arithmetic number, because the mean of its divisors is an integer number (53749044).

Almost surely, 2^197079817 is an apocalyptic number.

It is an amenable number.

197079817 is a deficient number, since it is larger than the sum of its proper divisors (17916359).

197079817 is a wasteful number, since it uses less digits than its factorization.

197079817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17916358.

The product of its (nonzero) digits is 222264, while the sum is 49.

The square root of 197079817 is about 14038.5119225650. The cubic root of 197079817 is about 581.9433593907.

The spelling of 197079817 in words is "one hundred ninety-seven million, seventy-nine thousand, eight hundred seventeen".