201640505 has 16 divisors (see below), whose sum is σ = 264311424. Its totient is φ = 146455680.

The previous prime is 201640499. The next prime is 201640511. The reversal of 201640505 is 505046102.

It is an interprime number because it is at equal distance from previous prime (201640499) and next prime (201640511).

It is not a de Polignac number, because 201640505 - 2¹⁴ = 201624121 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 50492 + ... + 54338.

It is an arithmetic number, because the mean of its divisors is an integer number (16519464).

Almost surely, 2^201640505 is an apocalyptic number.

It is an amenable number.

201640505 is a deficient number, since it is larger than the sum of its proper divisors (62670919).

201640505 is a wasteful number, since it uses less digits than its factorization.

201640505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4816.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 201640505 is about 14200.0177816790. The cubic root of 201640505 is about 586.3981508729.

Adding to 201640505 its reverse (505046102), we get a palindrome (706686607).

The spelling of 201640505 in words is "two hundred one million, six hundred forty thousand, five hundred five".