199974497197 has 2 divisors, whose sum is σ = 199974497198. Its totient is φ = 199974497196.

The previous prime is 199974497183. The next prime is 199974497249. The reversal of 199974497197 is 791794479991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176585688841 + 23388808356 = 420221^2 + 152934^2 .

It is a cyclic number.

It is not a de Polignac number, because 199974497197 - 2¹⁵ = 199974464429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199974497167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99987248598 + 99987248599.

It is an arithmetic number, because the mean of its divisors is an integer number (99987248599).

Almost surely, 2^199974497197 is an apocalyptic number.

It is an amenable number.

199974497197 is a deficient number, since it is larger than the sum of its proper divisors (1).

199974497197 is an equidigital number, since it uses as much as digits as its factorization.

199974497197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324060912, while the sum is 76.

The spelling of 199974497197 in words is "one hundred ninety-nine billion, nine hundred seventy-four million, four hundred ninety-seven thousand, one hundred ninety-seven".