197888501 has 2 divisors, whose sum is σ = 197888502. Its totient is φ = 197888500.

The previous prime is 197888491. The next prime is 197888503. The reversal of 197888501 is 105888791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124768900 + 73119601 = 11170^2 + 8551^2 .

It is a cyclic number.

It is not a de Polignac number, because 197888501 - 2⁶ = 197888437 is a prime.

It is a Sophie Germain prime.

Together with 197888503, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197888503) 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 as a sum of consecutive naturals, namely, 98944250 + 98944251.

It is an arithmetic number, because the mean of its divisors is an integer number (98944251).

Almost surely, 2^197888501 is an apocalyptic number.

It is an amenable number.

197888501 is a deficient number, since it is larger than the sum of its proper divisors (1).

197888501 is an equidigital number, since it uses as much as digits as its factorization.

197888501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 47.

The square root of 197888501 is about 14067.2847770990. The cubic root of 197888501 is about 582.7382421726.

The spelling of 197888501 in words is "one hundred ninety-seven million, eight hundred eighty-eight thousand, five hundred one".