197961997 has 8 divisors (see below), whose sum is σ = 199654560. Its totient is φ = 196276080.

The previous prime is 197961961. The next prime is 197962013. The reversal of 197961997 is 799169791.

197961997 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 197961997 - 2²³ = 189573389 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 (197961947) 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, 71122 + ... + 73852.

It is an arithmetic number, because the mean of its divisors is an integer number (24956820).

Almost surely, 2^197961997 is an apocalyptic number.

It is an amenable number.

197961997 is a deficient number, since it is larger than the sum of its proper divisors (1692563).

197961997 is a wasteful number, since it uses less digits than its factorization.

197961997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3323.

The product of its digits is 1928934, while the sum is 58.

The square root of 197961997 is about 14069.8968368642. The cubic root of 197961997 is about 582.8103764443.

The spelling of 197961997 in words is "one hundred ninety-seven million, nine hundred sixty-one thousand, nine hundred ninety-seven".