201191173 has 2 divisors, whose sum is σ = 201191174. Its totient is φ = 201191172.

The previous prime is 201191153. The next prime is 201191191. The reversal of 201191173 is 371191102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173132964 + 28058209 = 13158^2 + 5297^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201191173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201191153) 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, 100595586 + 100595587.

It is an arithmetic number, because the mean of its divisors is an integer number (100595587).

Almost surely, 2^201191173 is an apocalyptic number.

It is an amenable number.

201191173 is a deficient number, since it is larger than the sum of its proper divisors (1).

201191173 is an equidigital number, since it uses as much as digits as its factorization.

201191173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 25.

The square root of 201191173 is about 14184.1874282597. The cubic root of 201191173 is about 585.9622539724.

The spelling of 201191173 in words is "two hundred one million, one hundred ninety-one thousand, one hundred seventy-three".