201647441 has 2 divisors, whose sum is σ = 201647442. Its totient is φ = 201647440.

The previous prime is 201647429. The next prime is 201647443. The reversal of 201647441 is 144746102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144961600 + 56685841 = 12040^2 + 7529^2 .

It is a cyclic number.

It is not a de Polignac number, because 201647441 - 2⁶ = 201647377 is a prime.

Together with 201647443, 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 (201647443) 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, 100823720 + 100823721.

It is an arithmetic number, because the mean of its divisors is an integer number (100823721).

Almost surely, 2^201647441 is an apocalyptic number.

It is an amenable number.

201647441 is a deficient number, since it is larger than the sum of its proper divisors (1).

201647441 is an equidigital number, since it uses as much as digits as its factorization.

201647441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 201647441 is about 14200.2620046251. The cubic root of 201647441 is about 586.4048744079.

It can be divided in two parts, 20 and 1647441, that added together give a palindrome (1647461).

The spelling of 201647441 in words is "two hundred one million, six hundred forty-seven thousand, four hundred forty-one".