197654321 has 4 divisors (see below), whose sum is σ = 208057200. Its totient is φ = 187251444.

The previous prime is 197654309. The next prime is 197654329. The reversal of 197654321 is 123456791.

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 a de Polignac number, because none of the positive numbers 2^k-197654321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197654329) 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, 5201411 + ... + 5201448.

It is an arithmetic number, because the mean of its divisors is an integer number (52014300).

Almost surely, 2^197654321 is an apocalyptic number.

It is an amenable number.

197654321 is a deficient number, since it is larger than the sum of its proper divisors (10402879).

197654321 is a wasteful number, since it uses less digits than its factorization.

197654321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10402878.

The product of its digits is 45360, while the sum is 38.

The square root of 197654321 is about 14058.9587452272. The cubic root of 197654321 is about 582.5082818547.

The spelling of 197654321 in words is "one hundred ninety-seven million, six hundred fifty-four thousand, three hundred twenty-one".