197221797 has 10 divisors (see below), whose sum is σ = 294615398. Its totient is φ = 131481144.

The previous prime is 197221781. The next prime is 197221799. The reversal of 197221797 is 797122791.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 196868961 + 352836 = 14031^2 + 594^2 .

It is not a de Polignac number, because 197221797 - 2⁴ = 197221781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197221799) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1217338 + ... + 1217499.

Almost surely, 2^197221797 is an apocalyptic number.

It is an amenable number.

197221797 is a deficient number, since it is larger than the sum of its proper divisors (97393601).

197221797 is an equidigital number, since it uses as much as digits as its factorization.

197221797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2434849 (or 2434840 counting only the distinct ones).

The product of its digits is 111132, while the sum is 45.

The square root of 197221797 is about 14043.5678159078. The cubic root of 197221797 is about 582.0830734855.

The spelling of 197221797 in words is "one hundred ninety-seven million, two hundred twenty-one thousand, seven hundred ninety-seven".