197221157 has 8 divisors (see below), whose sum is σ = 225582336. Its totient is φ = 168906672.

The previous prime is 197221153. The next prime is 197221181. The reversal of 197221157 is 751122791.

197221157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 197221157 - 2² = 197221153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197221151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2093 + ... + 19970.

It is an arithmetic number, because the mean of its divisors is an integer number (28197792).

Almost surely, 2^197221157 is an apocalyptic number.

It is an amenable number.

197221157 is a deficient number, since it is larger than the sum of its proper divisors (28361179).

197221157 is a wasteful number, since it uses less digits than its factorization.

197221157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23347.

The product of its digits is 8820, while the sum is 35.

The square root of 197221157 is about 14043.5450296569. The cubic root of 197221157 is about 582.0824438500.

The spelling of 197221157 in words is "one hundred ninety-seven million, two hundred twenty-one thousand, one hundred fifty-seven".