197931973 has 2 divisors, whose sum is σ = 197931974. Its totient is φ = 197931972.

The previous prime is 197931971. The next prime is 197931977. The reversal of 197931973 is 379139791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114447204 + 83484769 = 10698^2 + 9137^2 .

It is an emirp because it is prime and its reverse (379139791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197931973 - 2¹ = 197931971 is a prime.

Together with 197931971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197931971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98965986 + 98965987.

It is an arithmetic number, because the mean of its divisors is an integer number (98965987).

Almost surely, 2^197931973 is an apocalyptic number.

It is an amenable number.

197931973 is a deficient number, since it is larger than the sum of its proper divisors (1).

197931973 is an equidigital number, since it uses as much as digits as its factorization.

197931973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 321489, while the sum is 49.

The square root of 197931973 is about 14068.8298376233. The cubic root of 197931973 is about 582.7809108841.

The spelling of 197931973 in words is "one hundred ninety-seven million, nine hundred thirty-one thousand, nine hundred seventy-three".