191601001 has 2 divisors, whose sum is σ = 191601002. Its totient is φ = 191601000.

The previous prime is 191600977. The next prime is 191601019. The reversal of 191601001 is 100106191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169520400 + 22080601 = 13020^2 + 4699^2 .

It is an emirp because it is prime and its reverse (100106191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191601001 - 2⁷ = 191600873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191601001.

It is not a weakly prime, because it can be changed into another prime (191601071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95800500 + 95800501.

It is an arithmetic number, because the mean of its divisors is an integer number (95800501).

Almost surely, 2^191601001 is an apocalyptic number.

It is an amenable number.

191601001 is a deficient number, since it is larger than the sum of its proper divisors (1).

191601001 is an equidigital number, since it uses as much as digits as its factorization.

191601001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 191601001 is about 13842.0013365120. The cubic root of 191601001 is about 576.4999286650.

Adding to 191601001 its reverse (100106191), we get a palindrome (291707192).

The spelling of 191601001 in words is "one hundred ninety-one million, six hundred one thousand, one".