199972571 has 2 divisors, whose sum is σ = 199972572. Its totient is φ = 199972570.

The previous prime is 199972567. The next prime is 199972573. The reversal of 199972571 is 175279991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199972571 - 2² = 199972567 is a prime.

Together with 199972573, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199972573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99986285 + 99986286.

It is an arithmetic number, because the mean of its divisors is an integer number (99986286).

Almost surely, 2^199972571 is an apocalyptic number.

199972571 is a deficient number, since it is larger than the sum of its proper divisors (1).

199972571 is an equidigital number, since it uses as much as digits as its factorization.

199972571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 357210, while the sum is 50.

The square root of 199972571 is about 14141.1658288841. The cubic root of 199972571 is about 584.7768121261.

The spelling of 199972571 in words is "one hundred ninety-nine million, nine hundred seventy-two thousand, five hundred seventy-one".