1640201 has 2 divisors, whose sum is σ = 1640202. Its totient is φ = 1640200.

The previous prime is 1640189. The next prime is 1640207. The reversal of 1640201 is 1020461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 900601 + 739600 = 949^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640201 - 2¹⁸ = 1378057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1640207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820100 + 820101.

It is an arithmetic number, because the mean of its divisors is an integer number (820101).

2^1640201 is an apocalyptic number.

It is an amenable number.

1640201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640201 is an equidigital number, since it uses as much as digits as its factorization.

1640201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1640201 is about 1280.7033223975. The cubic root of 1640201 is about 117.9321883671.

Adding to 1640201 its reverse (1020461), we get a palindrome (2660662).

The spelling of 1640201 in words is "one million, six hundred forty thousand, two hundred one".