197650121 has 4 divisors (see below), whose sum is σ = 197679744. Its totient is φ = 197620500.

The previous prime is 197650097. The next prime is 197650127. The reversal of 197650121 is 121056791.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 197650121 - 2²² = 193455817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197650127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416 + ... + 19886.

It is an arithmetic number, because the mean of its divisors is an integer number (49419936).

Almost surely, 2^197650121 is an apocalyptic number.

It is an amenable number.

197650121 is a deficient number, since it is larger than the sum of its proper divisors (29623).

197650121 is a wasteful number, since it uses less digits than its factorization.

197650121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29622.

The product of its (nonzero) digits is 3780, while the sum is 32.

The square root of 197650121 is about 14058.8093734854. The cubic root of 197650121 is about 582.5041558767.

The spelling of 197650121 in words is "one hundred ninety-seven million, six hundred fifty thousand, one hundred twenty-one".