197640001 has 4 divisors (see below), whose sum is σ = 212843092. Its totient is φ = 182436912.

The previous prime is 197639983. The next prime is 197640019. The reversal of 197640001 is 100046791.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (197639983) and next prime (197640019).

It can be written as a sum of positive squares in 2 ways, for example, as 67223601 + 130416400 = 8199^2 + 11420^2 .

It is a cyclic number.

It is not a de Polignac number, because 197640001 - 2⁵ = 197639969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197640041) 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, 7601526 + ... + 7601551.

It is an arithmetic number, because the mean of its divisors is an integer number (53210773).

Almost surely, 2^197640001 is an apocalyptic number.

It is an amenable number.

197640001 is a deficient number, since it is larger than the sum of its proper divisors (15203091).

197640001 is a wasteful number, since it uses less digits than its factorization.

197640001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15203090.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 197640001 is about 14058.4494521978. The cubic root of 197640001 is about 582.4942139945.

Adding to 197640001 its reverse (100046791), we get a palindrome (297686792).

The spelling of 197640001 in words is "one hundred ninety-seven million, six hundred forty thousand, one".