201399001 has 2 divisors, whose sum is σ = 201399002. Its totient is φ = 201399000.

The previous prime is 201398999. The next prime is 201399019. The reversal of 201399001 is 100993102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173054025 + 28344976 = 13155^2 + 5324^2 .

It is a cyclic number.

It is not a de Polignac number, because 201399001 - 2¹ = 201398999 is a prime.

Together with 201398999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (201399041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100699500 + 100699501.

It is an arithmetic number, because the mean of its divisors is an integer number (100699501).

Almost surely, 2^201399001 is an apocalyptic number.

201399001 is the 8976-th centered pentagonal number.

It is an amenable number.

201399001 is a deficient number, since it is larger than the sum of its proper divisors (1).

201399001 is an equidigital number, since it uses as much as digits as its factorization.

201399001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 201399001 is about 14191.5115826328. The cubic root of 201399001 is about 586.1639484658.

The spelling of 201399001 in words is "two hundred one million, three hundred ninety-nine thousand, one".